The 1968 Checker Marathon has 10 electrical connector parts with verified fitment on this page — 5 part types and 5 brands, covering all 3 engine options (3.8L 230cid L6, 5.0L 307cid V8 and 5.3L 327cid V8). Each part includes a manufacturer part number and application notes.
On the 1968 Checker Marathon, the connector system supplies the pigtails and connector bodies that terminate the vehicle harness at lamps, sensors and modules. Most of the listed parts are Headlamp Dimmer Switch Connector (4 parts), Horn Relay Connector (2 parts) and Voltage Regulator Connector (2 parts). The other 2 part types cover the remaining 2 parts.
The 1968 Checker Marathon was sold with 3 engines. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 1968 Checker Marathon electrical connector parts are STANDARD MOTOR PRODUCTS (4 parts), UNITED MOTOR PRODUCTS (3 parts) and ACDELCO (1 part), plus 2 more brands.
Each part number listed for the 1968 Checker Marathon opens a page with every vehicle that part fits.
Flasher Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 3.8L 230cid L6, 5.3L 327cid V8 | S957 | 🇺🇸 US 🇨🇦 CA | Terminal Quantity: 2 | View on Amazon |
This table covers the harness connectors at the Flasher. 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 S957.
Headlamp Dimmer Switch Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Fits: 3.8L 230cid L6, 5.3L 327cid V8 | PT1994 | 🇺🇸 US 🇨🇦 CA | Gold | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 3.8L 230cid L6, 5.3L 327cid V8 | HP3920 | 🇺🇸 US 🇨🇦 CA | Handy PackBlack | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 3.8L 230cid L6, 5.3L 327cid V8 | S72 | 🇺🇸 US 🇨🇦 CA | Black | View on Amazon |
| UNITED MOTOR PRODUCTS Fits: 3.8L 230cid L6, 5.3L 327cid V8 | CON139 | 🇺🇸 US 🇨🇦 CA | Headlamp Dimmer | View on Amazon |
This table covers the harness connectors at the Headlamp Dimmer 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.
4 Headlamp Dimmer Switch Connector parts are listed for the 1968 Checker Marathon, from STANDARD MOTOR PRODUCTS, ACDELCO and UNITED MOTOR PRODUCTS.
This group includes ACDELCO PT1994, STANDARD MOTOR PRODUCTS HP3920 and STANDARD MOTOR PRODUCTS S72 and the remaining parts above.
Horn Relay Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 3.8L 230cid L6, 5.3L 327cid V8 | S82 | 🇺🇸 US 🇨🇦 CA | Connector Shape: Square | View on Amazon |
| UNITED MOTOR PRODUCTS Fits: 3.8L 230cid L6, 5.3L 327cid V8 | CON173 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the harness connectors at the Horn Relay. 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.
2 Horn Relay Connector parts are listed for the 1968 Checker Marathon, from STANDARD MOTOR PRODUCTS and UNITED MOTOR PRODUCTS.
Part numbers include STANDARD MOTOR PRODUCTS S82 and UNITED MOTOR PRODUCTS CON173.
Voltage Regulator Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UNITED MOTOR PRODUCTS Fits: 3.8L 230cid L6, 5.3L 327cid V8 | CON159 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WELLS Fits: 3.8L 230cid L6, 5.3L 327cid V8 | 1P1019 | 🇺🇸 US 🇨🇦 CA | Connector | 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.
2 Voltage Regulator Connector parts for the 1968 Checker Marathon come from 2 brands — UNITED MOTOR PRODUCTS and WELLS.
This group includes UNITED MOTOR PRODUCTS CON159 and WELLS 1P1019.
Washer Pump Connector
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAI GLOBAL Fits: 3.8L 230cid L6, 5.3L 327cid 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.
One part is listed for the 1968 Checker Marathon — WAI GLOBAL 399002.
Buying Electrical Connector Parts for a 1968 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: Headlamp Dimmer Switch Connector and Horn Relay Connector .
Frequently Asked Questions
How many electrical connector parts fit the 1968 Checker Marathon?
Our catalog currently lists 10 electrical connector parts for the 1968 Checker Marathon across 5 subcategories and 5 brands, covering all 3 engine options (3.8L 230cid L6, 5.0L 307cid V8 and 5.3L 327cid V8). Each part is matched to the engine(s) it fits.
Do electrical connector parts differ between 1968 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 1968 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 1968 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 1968 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 1968 Checker Marathon
Electrical Connector Parts for Other Checker Marathon Years
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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.