11 Electrical connector parts are listed for the 1978 Checker Marathon, in 4 part types, covering all 3 engine options (4.1L 250cid L6, 5.0L 305cid V8 and 5.7L 350cid V8). Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 1978 Checker Marathon, the connector system supplies the pigtails and connector bodies that terminate the vehicle harness at lamps, sensors and modules. 10 parts of the 11 listed are Voltage Regulator Connector (8 parts), Fuel Pump CutOff Switch Connector (1 part) and Ignition Coil Connector (1 part). The other 1 part type covers the remaining 1 part.
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.
6 brands supply electrical connector parts for the 1978 Checker Marathon, led by STANDARD MOTOR PRODUCTS (5 parts), WELLS (2 parts) and ACDELCO (1 part), plus 3 more brands.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 1978 Checker Marathon. 2 parts have it, including ACDELCO PT2288 (Voltage Regulator Connector) and STANDARD MOTOR PRODUCTS HP3870 (Voltage Regulator Connector). Each part number opens a page with every vehicle that part fits.
Fuel Pump CutOff Switch Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 5.0L 305cid V8 | S2212 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the harness connectors at the Fuel Pump CutOff Switch. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
One part is listed for the 1978 Checker Marathon — STANDARD MOTOR PRODUCTS S2212.
Ignition Coil Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 5.0L 305cid V8 | ICK100 | 🇺🇸 US 🇨🇦 CA | Repair KitWiring Harness | View on Amazon |
This table covers the harness connectors at the Ignition Coil. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
This group shows a single part: STANDARD MOTOR PRODUCTS ICK100.
Voltage Regulator Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Popular Fits: 5.0L 305cid V8 | PT2288 | 🇺🇸 US 🇨🇦 CA | Gold | View on Amazon |
| STANDARD MOTOR PRODUCTS Popular Fits: 5.0L 305cid V8 | HP3870 | 🇺🇸 US 🇨🇦 CA | Handypack | View on Amazon |
| FAMOUS BRAND Fits: 5.0L 305cid V8 | PTA1165 | 🇺🇸 US 🇨🇦 CA | Harness | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 5.0L 305cid V8 | S78 | 🇺🇸 US 🇨🇦 CA | Whitewith 2 Female Terminals | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 5.0L 305cid V8 | S705 | 🇺🇸 US 🇨🇦 CA | Gray, White2 Terminal Female, 2 Terminal Male | View on Amazon |
| UNITED MOTOR PRODUCTS Fits: 5.0L 305cid V8 | CON159 | 🇺🇸 US 🇨🇦 CA | Whitewith 2 Female Terminals | View on Amazon |
| WELLS Fits: 5.0L 305cid V8 | 1P1019 | 🇺🇸 US 🇨🇦 CA | Connector | View on Amazon |
| WELLS Fits: 5.0L 305cid V8 | 1P1241 | 🇺🇸 US 🇨🇦 CA | Harness | View on Amazon |
This table covers the harness connectors at the Voltage Regulator. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
8 Voltage Regulator Connector parts are listed for the 1978 Checker Marathon, from STANDARD MOTOR PRODUCTS, WELLS, ACDELCO and 2 other brands. ACDELCO PT2288 carries the "Popular" badge.
This group includes ACDELCO PT2288, STANDARD MOTOR PRODUCTS HP3870 and FAMOUS BRAND PTA1165 and the remaining parts above.
Washer Pump Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAI GLOBAL Fits: 5.0L 305cid V8 | 399002 | 🇺🇸 US 🇨🇦 CA | AccessoryUniversal Switch for Washer Pump System | View on Amazon |
This table covers the harness connectors at the Washer Pump. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.
This group shows a single part: WAI GLOBAL 399002.
Buying Electrical Connector Parts for a 1978 Checker Marathon
On this vehicle, the connector system supplies the pigtails and connector bodies that terminate the vehicle harness at lamps, sensors and modules.
- Match the engine first. Every electrical connector 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, use heat-shrink crimp connectors rather than twist-and-tape for any pigtail splice, especially outside the cabin.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Voltage Regulator Connector and Fuel Pump CutOff Switch Connector .
Frequently Asked Questions
How many electrical connector parts fit the 1978 Checker Marathon?
Our catalog currently lists 11 electrical connector parts for the 1978 Checker Marathon across 4 subcategories and 6 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 connector parts differ between 1978 Checker Marathon engines?
Yes. Every electrical connector 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 connector problems on a 1978 Checker Marathon?
Common symptoms include intermittent faults that move when the harness is wiggled, green corrosion inside a plug, or melted connector housings near heat sources. 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, use heat-shrink crimp connectors rather than twist-and-tape for any pigtail splice, especially outside the cabin.
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 match the connector by terminal count and keyway, not just appearance — many families look identical but will not lock. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 1978 Checker Marathon
Electrical Connector 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.