This page lists 9 electrical switch & relay parts for the 1968 Checker Marathon, across 2 part types, covering all 3 engine options (3.8L 230cid L6, 5.0L 307cid V8 and 5.3L 327cid V8). Every part shows its brand, manufacturer part number and fitment notes.
The switch and relay system on the 1968 Checker Marathon covers the switches, relays and flashers that route power to everything the driver touches. All 9 listed parts are Dimmer Switch (6 parts) and Horn Relay (3 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.
5 brands supply electrical switch & relay parts for the 1968 Checker Marathon, led by STANDARD MOTOR PRODUCTS (3 parts), ROSTRA (2 parts) and WELLS (2 parts), plus 2 more brands. Quality grades include Standard Replacement and Economy.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 1968 Checker Marathon. 2 parts have it, including STANDARD MOTOR PRODUCTS DS72T (Dimmer Switch) and GM GENUINE D808 (Dimmer Switch). Each part number opens a page with every vehicle that part fits.
Dimmer Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular Fits: 3.8L 230cid L6, 5.3L 327cid V8 | DS72T | 🇺🇸 US 🇨🇦 CA | T-Series | View on Amazon |
| SKP Fits: 3.8L 230cid L6 | SKDS72 | 🇺🇸 US | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Popular Fits: 3.8L 230cid L6, 5.3L 327cid V8 | D808 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| ROSTRA Fits: 3.8L 230cid L6, 5.3L 327cid V8 | 650003 | 🇺🇸 US 🇨🇦 CA | with floor mounting | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 3.8L 230cid L6, 5.3L 327cid V8 | DS72 | 🇺🇸 US 🇨🇦 CA | Finish: Cast Iron | View on Amazon |
| WELLS Fits: 3.8L 230cid L6, 5.3L 327cid V8 | 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 for the 1968 Checker Marathon come from 5 brands — STANDARD MOTOR PRODUCTS, SKP, GM GENUINE and 2 other brands. The "Popular" part is STANDARD MOTOR PRODUCTS DS72T.
The Economy section lists 2 options from STANDARD MOTOR PRODUCTS and SKP — the catalog's value-priced group. STANDARD MOTOR PRODUCTS DS72T is listed in this group.
In the Standard Replacement grade, GM GENUINE, ROSTRA, STANDARD MOTOR PRODUCTS and 1 other brand supply 4 parts: built to original-equipment specification. A representative part number is GM GENUINE D808.
Listed part numbers: STANDARD MOTOR PRODUCTS DS72T, SKP SKDS72 and GM GENUINE D808, plus the other parts above.
Horn Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ROSTRA Fits: 3.8L 230cid L6, 5.3L 327cid V8 | 600150 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| STANDARD MOTOR PRODUCTS Fits: 3.8L 230cid L6, 5.3L 327cid V8 | HR117 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WELLS Fits: 3.8L 230cid L6, 5.3L 327cid V8 | 1R1716 | 🇺🇸 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 for the 1968 Checker Marathon come from 3 brands — ROSTRA, STANDARD MOTOR PRODUCTS and WELLS.
This group includes ROSTRA 600150, STANDARD MOTOR PRODUCTS HR117 and WELLS 1R1716.
Buying Electrical Switch & Relay Parts for a 1968 Checker Marathon
On this vehicle, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches.
- Match the engine first. Every electrical switch & relay 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, 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 1968 Checker Marathon?
Our catalog currently lists 9 electrical switch & relay parts for the 1968 Checker Marathon across 2 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 switch & relay parts differ between 1968 Checker Marathon engines?
Yes. Every electrical switch & relay 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 switch & relay problems on a 1968 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 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 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 1968 Checker Marathon
Electrical Switch & Relay 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.