The 1978 Checker Marathon has 52 electrical parts with verified fitment on this page — 18 part types and 11 brands, covering all 3 engine options (4.1L 250cid L6, 5.0L 305cid V8 and 5.7L 350cid V8). Each part includes a manufacturer part number and application notes.
On the 1978 Checker Marathon, the electrical system covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors. 21 parts of the 52 listed are Alternator / Generator (8 parts), Battery (7 parts) and Battery Cable (6 parts). The other 15 part types cover the remaining 31 parts.
The 1978 Checker Marathon was sold with 3 engines. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
11 brands supply electrical parts for the 1978 Checker Marathon, led by STANDARD MOTOR PRODUCTS (13 parts), WELLS (9 parts) and DEKA (8 parts), plus 8 more brands. Quality grades include Remanufactured, AGM and Standard Replacement.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 1978 Checker Marathon. 8 parts have it, including ACDELCO 3342114 (Alternator / Generator) and DEKA 9A78DT (Battery). Each part number opens a page with every vehicle that part fits.
Alternator / Generator
New
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PURE ENERGY Fits: 5.0L 305cid V8 | 7127109N | 🇺🇸 US 🇨🇦 CA | OE Replacement61 Amps | View on Amazon |
| PURE ENERGY Fits: 5.0L 305cid V8 | 7127SW3N | 🇺🇸 US 🇨🇦 CA | with 63 Amps Alternator1 Wire Universal GM Alternator | View on Amazon |
Remanufactured
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Popular Fits: 5.0L 305cid V8 | 3342114 | 🇺🇸 US 🇨🇦 CA | GoldRemanufactured | View on Amazon |
| ACDELCO Popular Fits: 5.0L 305cid V8 | 3342614 | 🇺🇸 US 🇨🇦 CA | GoldRemanufactured | View on Amazon |
| FVP Fits: 5.0L 305cid V8 | 7127109 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| FVP Fits: 5.0L 305cid V8 | 7127SW3 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| PURE ENERGY Fits: 5.0L 305cid V8 | 7127109 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| PURE ENERGY Fits: 5.0L 305cid V8 | 7127SW3 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
This table covers the alternators that charge the battery and run the electrical load. Typical signs include dim lights at idle, a battery lamp, or a growl from the charging pulley. Load-test the battery and inspect the belt and grounds — a bad ground mimics a failed alternator.
8 Alternator / Generator parts for the 1978 Checker Marathon come from 3 brands — PURE ENERGY, ACDELCO and FVP. The "Popular" part is ACDELCO 3342114.
The New section lists 2 options from PURE ENERGY — brand-new units rather than rebuilt ones. PURE ENERGY 7127109N is listed in this group.
The Remanufactured section lists 6 options from ACDELCO, FVP and PURE ENERGY — factory-rebuilt units with new wear components. ACDELCO 3342114 is listed in this group.
Listed part numbers: ACDELCO 3342114, PURE ENERGY 7127109N and PURE ENERGY 7127SW3N, plus the other parts above.
Alternator / Generator Brush
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 5.0L 305cid V8 | RX103A | 🇺🇸 US 🇨🇦 CA | Alternator Brush Holder Assembly | View on Amazon |
| WELLS Fits: 5.0L 305cid V8 | 5A1015 | 🇺🇸 US 🇨🇦 CA | with Delco Alternator | View on Amazon |
This table covers the brushes inside the alternator.
2 Alternator / Generator Brush parts for the 1978 Checker Marathon come from 2 brands — STANDARD MOTOR PRODUCTS and WELLS.
This group includes STANDARD MOTOR PRODUCTS RX103A and WELLS 5A1015.
Alternator / Generator Brush Holder
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 5.0L 305cid V8 | RX103A | 🇺🇸 US 🇨🇦 CA | Alternator Brush Holder Assembly | View on Amazon |
This table covers the holders that carry the alternator brushes.
This group shows a single part: STANDARD MOTOR PRODUCTS RX103A.
Alternator / Generator Diode Rectifier
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: 5.0L 305cid V8 | 2D3001 | 🇺🇸 US 🇨🇦 CA | with Delco AlternatorDiode Trio | View on Amazon |
This table covers the rectifier diode packs in the alternator.
This group shows a single part: WELLS 2D3001.
Alternator / Generator Repair Kit
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 5.0L 305cid V8 | AK6 | 🇺🇸 US 🇨🇦 CA | Voltage: 12 | View on Amazon |
This table covers the Alternator / Generator repair kits.
One part is listed for the 1978 Checker Marathon — STANDARD MOTOR PRODUCTS AK6.
Battery
AGM (Extended Life)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DEKA Popular Fits: 5.0L 305cid V8 | 9A78DT | 🇺🇸 US 🇨🇦 CA | IntimidatorAGM | View on Amazon |
| FVP Popular Fits: 5.0L 305cid V8 | 78AGMG | 🇺🇸 US 🇨🇦 CA | Platinum AGMBCI Group: 78 | View on Amazon |
| ACDELCO Fits: 5.0L 305cid V8 | 78XAGM | 🇺🇸 US 🇨🇦 CA | AGMBCI Group: 78 | View on Amazon |
| DEKA Fits: 5.0L 305cid V8 | 9A78 | 🇺🇸 US 🇨🇦 CA | IntimidatorAGM | View on Amazon |
| EXIDE Fits: 5.0L 305cid V8 | RF31D | 🇺🇸 US 🇨🇦 CA | RoadforceBCI Group 31 | View on Amazon |
| EXIDE Fits: 5.0L 305cid V8 | XRF31D | 🇺🇸 US 🇨🇦 CA | RoadforceBCI Group 31 | View on Amazon |
Performance AGM (Extended Life + Increased Power)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FULLRIVER Fits: 5.0L 305cid V8 | FT82578 | 🇺🇸 US 🇨🇦 CA | AGMBCI Group 78 | View on Amazon |
This table covers the batteries listed by group size and specification. Typical signs include slow cranking, a battery lamp, or a no-start after the vehicle sat overnight. Confirm group size and terminal layout in the notes. Clean the posts and the ground before condemning the battery.
7 Battery parts are listed for the 1978 Checker Marathon, from DEKA, EXIDE, FVP and 2 other brands. DEKA 9A78DT carries the "Popular" badge.
The AGM (Extended Life) section lists 6 options from DEKA, EXIDE, FVP and 1 other brand — grouped under the catalog's "AGM (Extended Life)" designation — the notes column spells out what sets them apart. DEKA 9A78DT is listed in this group.
The Performance AGM (Extended Life + Increased Power) section lists 1 option from FULLRIVER — grouped under the catalog's "Performance AGM (Extended Life + Increased Power)" designation — the notes column spells out what sets them apart. FULLRIVER FT82578 is listed in this group.
This group includes DEKA 9A78DT, FVP 78AGMG and ACDELCO 78XAGM and the remaining parts above.
Battery Cable
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular Fits: 5.0L 305cid V8 | DR31A | 🇺🇸 US 🇨🇦 CA | Direct OE ReplacementMaterial: Steel | View on Amazon |
| WELLS Popular Fits: 5.0L 305cid V8 | 4C4000 | 🇺🇸 US 🇨🇦 CA | Ignition Coil Ground Strap | View on Amazon |
| DEKA Fits: 5.0L 305cid V8 | 00813 | 🇺🇸 US 🇨🇦 CA | Black4 Gauge | View on Amazon |
| DEKA Fits: 5.0L 305cid V8 | 00308 | 🇺🇸 US 🇨🇦 CA | Black4 Gauge | View on Amazon |
| DEKA Fits: 5.0L 305cid V8 | 00332 | 🇺🇸 US 🇨🇦 CA | Red4 Gauge | View on Amazon |
| DEKA Fits: 5.0L 305cid V8 | 00305 | 🇺🇸 US 🇨🇦 CA | Red4 Gauge | View on Amazon |
This table covers the positive and ground cables that run from the battery. Typical signs include a stretched or frayed cable, or a control that no longer reaches the end of its travel. Route the new cable through the same clips. A kinked cable binds and fails early.
6 Battery Cable parts for the 1978 Checker Marathon come from 3 brands — DEKA, STANDARD MOTOR PRODUCTS and WELLS. The "Popular" part is STANDARD MOTOR PRODUCTS DR31A.
Listed part numbers: STANDARD MOTOR PRODUCTS DR31A, WELLS 4C4000 and DEKA 00813, plus the other parts above.
Battery Terminal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DEKA Fits: 5.0L 305cid V8 | 00350 | 🇺🇸 US 🇨🇦 CA | Top Post Terminal | View on Amazon |
| DEKA Fits: 5.0L 305cid V8 | 01056 | 🇺🇸 US 🇨🇦 CA | Top Post Terminal Lead Free | View on Amazon |
This table covers the terminals and clamps that connect cables to the battery posts.
DEKA supplies both parts for the 1978 Checker Marathon.
Listed part numbers: DEKA 00350 and DEKA 01056.
Flasher
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TRIDON / NOVITA Fits: 5.0L 305cid V8 | LF12 | 🇺🇸 US 🇨🇦 CA | Loud Flasher2 Terminal | View on Amazon |
| TRIDON / NOVITA Fits: 5.0L 305cid V8 | LF12K | 🇺🇸 US 🇨🇦 CA | Loud Flasher | View on Amazon |
This table covers the flasher units that blink the turn signals and hazards.
TRIDON / NOVITA supplies both parts for the 1978 Checker Marathon.
Part numbers include TRIDON / NOVITA LF12 and TRIDON / NOVITA LF12K.
Horn
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 5.0L 305cid V8 | HN20 | 🇺🇸 US 🇨🇦 CA | Low Tone | View on Amazon |
| WELLS Fits: 5.0L 305cid V8 | 1H1001 | 🇺🇸 US 🇨🇦 CA | Low Note HornUniversal mount for 12 Volt negative ground systems. | View on Amazon |
This table covers the horns mounted in the front of the vehicle.
2 Horn parts are listed for the 1978 Checker Marathon, from STANDARD MOTOR PRODUCTS and WELLS.
This group includes STANDARD MOTOR PRODUCTS HN20 and WELLS 1H1001.
Radio Capacitor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 5.0L 305cid V8 | RC3 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WELLS Fits: 5.0L 305cid V8 | 1B1003 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the capacitors that suppress radio noise.
2 Radio Capacitor parts are listed for the 1978 Checker Marathon, from STANDARD MOTOR PRODUCTS and WELLS.
This group includes STANDARD MOTOR PRODUCTS RC3 and WELLS 1B1003.
Starter Bolt
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ARP Fits: 5.0L 305cid V8 | 4303501 | 🇺🇸 US 🇨🇦 CA | 12 Point Bolt Head | View on Amazon |
This table covers the Starter bolts.
This group shows a single part: ARP 4303501.
Starter Brush
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 5.0L 305cid V8 | RX60 | 🇺🇸 US 🇨🇦 CA | Width (In): 3/4 | View on Amazon |
| WELLS Fits: 5.0L 305cid V8 | 5A1011 | 🇺🇸 US 🇨🇦 CA | with Delco Starter | View on Amazon |
This table covers the brushes inside the starter motor.
2 Starter Brush parts are listed for the 1978 Checker Marathon, from STANDARD MOTOR PRODUCTS and WELLS.
This group includes STANDARD MOTOR PRODUCTS RX60 and WELLS 5A1011.
Starter Drive
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 5.0L 305cid V8 | SDN1A | 🇺🇸 US 🇨🇦 CA | Direct OE Replacement Number of Gear Teeth 9 | View on Amazon |
This table covers the starter drives that engage the flywheel ring gear.
One part is listed for the 1978 Checker Marathon — STANDARD MOTOR PRODUCTS SDN1A.
Starter Motor
New
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PURE ENERGY Popular Fits: 5.0L 305cid V8 | 3510MSN | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| FVP Fits: 5.0L 305cid V8 | 3510MSN | 🇺🇸 US 🇨🇦 CA | New | View on Amazon |
Remanufactured
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Fits: 5.0L 305cid V8 | 3361824 | 🇺🇸 US 🇨🇦 CA | GoldRemanufactured | View on Amazon |
| FVP Fits: 5.0L 305cid V8 | 3510S | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| PURE ENERGY Fits: 5.0L 305cid V8 | 3510S | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
This table covers the starter motors that crank the engine. Typical signs include no motion, a squeal, or a motor that only runs on one speed. Confirm power, ground and the control module before replacing the motor.
5 Starter Motor parts for the 1978 Checker Marathon come from 3 brands — PURE ENERGY, FVP and ACDELCO. The "Popular" part is PURE ENERGY 3510MSN.
The New section: 2 options from PURE ENERGY and FVP. PURE ENERGY 3510MSN is listed in this group.
The Remanufactured section: 3 options from ACDELCO, FVP and PURE ENERGY. ACDELCO 3361824 is listed in this group.
This group includes PURE ENERGY 3510MSN and ACDELCO 3361824 and the remaining parts above.
Starter Solenoid
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FAMOUS BRAND Fits: 5.0L 305cid V8 | 84016 | 🇺🇸 US 🇨🇦 CA | New Solenoid | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 5.0L 305cid V8 | SS200T | 🇺🇸 US 🇨🇦 CA | T-Series | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular Fits: 5.0L 305cid V8 | SS200 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WELLS Fits: 5.0L 305cid V8 | 1M1027A | 🇺🇸 US 🇨🇦 CA | Premium | View on Amazon |
| WELLS Fits: 5.0L 305cid V8 | 1M1027 | 🇺🇸 US 🇨🇦 CA | Mounting Hardware Included: YES | View on Amazon |
This table covers the Starter solenoids. Typical signs include a harsh or missing shift, or a code for this solenoid circuit. Check resistance and the connector before dropping the pan for a solenoid.
5 Starter Solenoid parts for the 1978 Checker Marathon come from 3 brands — STANDARD MOTOR PRODUCTS, WELLS and FAMOUS BRAND. The "Popular" part is STANDARD MOTOR PRODUCTS SS200.
The Economy section lists 2 options from FAMOUS BRAND and STANDARD MOTOR PRODUCTS — the catalog's value-priced group. FAMOUS BRAND 84016 is listed in this group.
In the Standard Replacement grade, WELLS and STANDARD MOTOR PRODUCTS supply 3 parts: built to original-equipment specification. A representative part number is STANDARD MOTOR PRODUCTS SS200.
Part numbers include STANDARD MOTOR PRODUCTS SS200, FAMOUS BRAND 84016 and STANDARD MOTOR PRODUCTS SS200T, among others listed above.
Starter Solenoid Repair Kit
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 5.0L 305cid V8 | SS408K | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Starter Solenoid repair kits.
One part is listed for the 1978 Checker Marathon — STANDARD MOTOR PRODUCTS SS408K.
Voltage Regulator
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 5.0L 305cid V8 | VR111T | 🇺🇸 US 🇨🇦 CA | T-Series | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 5.0L 305cid V8 | VR111 | 🇺🇸 US 🇨🇦 CA | Direct OE Replacement12 Volt | View on Amazon |
| WELLS Fits: 5.0L 305cid V8 | 1V1032 | 🇺🇸 US 🇨🇦 CA | with Delco Alternator | View on Amazon |
This table covers the regulators that control alternator output voltage.
3 Voltage Regulator parts are listed for the 1978 Checker Marathon, from STANDARD MOTOR PRODUCTS and WELLS.
Economy: 1 part, from STANDARD MOTOR PRODUCTS. A representative part number is STANDARD MOTOR PRODUCTS VR111T.
The Standard Replacement section: 2 options from STANDARD MOTOR PRODUCTS and WELLS. STANDARD MOTOR PRODUCTS VR111 is listed in this group.
This group includes STANDARD MOTOR PRODUCTS VR111T, STANDARD MOTOR PRODUCTS VR111 and WELLS 1V1032.
Buying Electrical Parts for a 1978 Checker Marathon
On this vehicle, the electrical system covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors.
- Match the engine first. Every electrical part here is engine-specific; each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, clean or renew the battery terminals and grounds with any charging-system repair.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Alternator / Generator and Battery .
Frequently Asked Questions
How many electrical parts fit the 1978 Checker Marathon?
Our catalog currently lists 52 electrical parts for the 1978 Checker Marathon across 18 subcategories and 11 brands, covering all 3 engine options (4.1L 250cid L6, 5.0L 305cid V8 and 5.7L 350cid V8). Each part is matched to the engine(s) it fits.
Do electrical parts differ between 1978 Checker Marathon engines?
Yes. Every electrical part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of electrical problems on a 1978 Checker Marathon?
Common symptoms include slow cranking on cold mornings, a battery light that flickers, dim lights at idle, or a check-engine code pointing at a sensor circuit. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, clean or renew the battery terminals and grounds with any charging-system repair.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 1978 Checker Marathon was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 1978 Checker Marathon?
First match the engine — each row shows which engine(s) the part fits. Then test before replacing — a failed alternator and a bad ground can look identical, and sensors are frequently condemned for wiring faults. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 1978 Checker Marathon
Electrical Parts for Other Checker Marathon Years
Switch vehicle or jump to a subcategory
Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.