This page lists 12 electrical switch & relay parts for the 1972 Checker Marathon, across 4 part types, covering both the 4.1L 250cid L6 and the 5.7L 350cid V8. Every part shows its brand, manufacturer part number and fitment notes.
On the 1972 Checker Marathon, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches. 11 parts of the 12 listed are Dimmer Switch (6 parts), Horn Relay (3 parts) and Fuel Pump Cutoff Switch (2 parts). The other 1 part type covers the remaining 1 part.
The 1972 Checker Marathon was sold with both the 4.1L 250cid L6 and the 5.7L 350cid V8. All 12 parts on this page fit every engine.
The most listed brands for 1972 Checker Marathon electrical switch & relay parts are STANDARD MOTOR PRODUCTS (4 parts), ROSTRA (3 parts) and WELLS (2 parts), plus 3 more brands. Quality grades include Standard Replacement and Economy.
2 parts on this 1972 Checker Marathon page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including STANDARD MOTOR PRODUCTS DS72T (Dimmer Switch) and GM GENUINE D808 (Dimmer Switch). Click any part number to see every vehicle that part fits.
Accessory Power Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ROSTRA Fits: all 1972 Marathon engines | 600426 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the relays that control the Accessory Power circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.
One part is listed for the 1972 Checker Marathon — ROSTRA 600426.
Dimmer Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular Fits: all 1972 Marathon engines | DS72T | 🇺🇸 US 🇨🇦 CA | T-Series | View on Amazon |
| SKP Fits: all 1972 Marathon engines | SKDS72 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Popular Fits: all 1972 Marathon engines | D808 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| ROSTRA Fits: all 1972 Marathon engines | 650003 | 🇺🇸 US 🇨🇦 CA | with floor mounting | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: all 1972 Marathon engines | DS72 | 🇺🇸 US 🇨🇦 CA | Finish: Cast Iron | View on Amazon |
| WELLS Fits: all 1972 Marathon engines | 1S4829 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the dimmer switches that select headlamp high and low beam. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
6 Dimmer Switch parts are listed for the 1972 Checker Marathon, from STANDARD MOTOR PRODUCTS, SKP, GM GENUINE and 2 other brands. STANDARD MOTOR PRODUCTS DS72T carries the "Popular" badge. All of them fit every engine offered in the 1972 Marathon.
In the Economy grade, STANDARD MOTOR PRODUCTS and SKP supply 2 parts: the catalog's value-priced group. A representative part number is STANDARD MOTOR PRODUCTS DS72T.
The Standard Replacement section lists 4 options from GM GENUINE, ROSTRA, STANDARD MOTOR PRODUCTS and 1 other brand — built to original-equipment specification. GM GENUINE D808 is listed in this group.
Part numbers include STANDARD MOTOR PRODUCTS DS72T, SKP SKDS72 and GM GENUINE D808, among others listed above.
Fuel Pump Cutoff Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Fits: all 1972 Marathon engines | D1876D | 🇺🇸 US 🇨🇦 CA | Gold | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: all 1972 Marathon engines | FV7 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Fuel Pump Cutoff switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
2 Fuel Pump Cutoff Switch parts for the 1972 Checker Marathon come from 2 brands — ACDELCO and STANDARD MOTOR PRODUCTS. Every part fits both the 4.1L 250cid L6 and the 5.7L 350cid V8.
Listed part numbers: ACDELCO D1876D and STANDARD MOTOR PRODUCTS FV7.
Horn Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ROSTRA Fits: all 1972 Marathon engines | 600426 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| STANDARD MOTOR PRODUCTS Fits: all 1972 Marathon engines | HR138 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WELLS Fits: all 1972 Marathon engines | 1R2217 | 🇺🇸 US 🇨🇦 CA | Mounting Bracket Included: YES | View on Amazon |
This table covers the relays that control the Horn circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.
3 Horn Relay parts are listed for the 1972 Checker Marathon, from ROSTRA, STANDARD MOTOR PRODUCTS and WELLS. All of them fit every engine offered in the 1972 Marathon.
Part numbers include ROSTRA 600426, STANDARD MOTOR PRODUCTS HR138 and WELLS 1R2217.
Buying Electrical Switch & Relay Parts for a 1972 Checker Marathon
On this vehicle, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches.
- You do not need to pick an engine: every electrical switch & relay part on this page fits both the 4.1L 250cid L6 and the 5.7L 350cid V8.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, inspect the connector terminals behind any failed switch — heat damage there will kill the new part too.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Dimmer Switch and Horn Relay .
Frequently Asked Questions
How many electrical switch & relay parts fit the 1972 Checker Marathon?
Our catalog currently lists 12 electrical switch & relay parts for the 1972 Checker Marathon across 4 subcategories and 6 brands, covering both the 4.1L 250cid L6 and the 5.7L 350cid V8. Each part is matched to the engine(s) it fits.
Do electrical switch & relay parts differ between 1972 Checker Marathon engines?
No. On this page every electrical switch & relay part fits both the 4.1L 250cid L6 and the 5.7L 350cid V8. You do not need to pick an engine to choose the right row — use the notes for position and trim.
What are the signs of electrical switch & relay problems on a 1972 Checker Marathon?
Common symptoms include accessories that work intermittently, a click without action, or one function dead while its fuse tests fine. 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, inspect the connector terminals behind any failed switch — heat damage there will kill the new part too.
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 1972 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 1972 Checker Marathon?
Every part on this page already fits both the 4.1L 250cid L6 and the 5.7L 350cid V8. Then swap a suspect relay with an identical known-good one from the fuse box before buying — it is the fastest diagnostic there is. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 1972 Checker Marathon
Electrical Switch & Relay Parts for Other Checker Marathon Years
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