6 Electrical switch & relay parts are listed for the 2018 Ram 4000, in 4 part types, covering the 5.7L V8 engine. Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 2018 Ram 4000, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches. 5 parts of the 6 listed are Power Window Switch (3 parts), A/C Refrigerant Pressure Switch (1 part) and Cruise Control Switch (1 part). The other 1 part type covers the remaining 1 part.
The 2018 Ram 4000 came with a single engine, the 5.7L V8, and every part is verified against it.
2 brands supply electrical switch & relay parts for the 2018 Ram 4000, led by DORMAN (5 parts) and UAC (1 part).
Each part number listed for the 2018 Ram 4000 opens a page with every vehicle that part fits.
A/C Refrigerant Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UAC | SW10008C | 🇲🇽 MX | Pressure Transducer | View on Amazon |
This table covers the pressure switches on the A/C circuit. 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.
One part is listed for the 2018 Ram 4000 — UAC SW10008C.
Cruise Control Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 601607 | 🇲🇽 MX | Right4 Button | View on Amazon |
This table covers the Cruise Control 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.
This group shows a single part: DORMAN 601607.
Ignition Starter Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 601086 | 🇲🇽 MX | Requires Pin From Original Mfg For Proper Programming | View on Amazon |
This table covers the ignition switches that feed the starter circuit. 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.
This group shows a single part: DORMAN 601086.
Power Window Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 920508 | 🇲🇽 MX | Fits Rear LeftCrew Model or PL Model | View on Amazon |
| DORMAN | 920541 | 🇲🇽 MX | Front RightCrew Model or PL Model | View on Amazon |
| DORMAN | 901989 | 🇲🇽 MX | Front LeftCrew Model or PL Model | View on Amazon |
This table covers the switches that command each window motor. 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.
DORMAN supplies the 3 Power Window Switch parts for the 2018 Ram 4000.
Listed part numbers: DORMAN 920508, DORMAN 920541 and DORMAN 901989.
Buying Electrical Switch & Relay Parts for a 2018 Ram 4000
On this vehicle, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches.
- Confirm you have the 5.7L V8 engine — every part on this page is matched to it.
- 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: Power Window Switch and A/C Refrigerant Pressure Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2018 Ram 4000?
Our catalog currently lists 6 electrical switch & relay parts for the 2018 Ram 4000 across 4 subcategories and 2 brands, covering the 5.7L V8 engine. Each part is matched to the engine(s) it fits.
What are the signs of electrical switch & relay problems on a 2018 Ram 4000?
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 2018 Ram 4000 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 2018 Ram 4000?
Every part on this page is matched to the 5.7L V8 engine. 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 2018 Ram 4000
Electrical Switch & Relay Parts for Other Ram 4000 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.