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How to Install the 40 AMP Dual Electric Fan Relay Kit?
Connect the color-coded wires, refer wiring diagram on package.
Red-to +12VDC
Coffee-to Fan Positive
Black-to Ignition
Grey-to Sending Unit
Notice:
Please check product pictures before purchase and please search video by "Fan Relay Installation" when install it in doubt.
Please ensure the inlet voltage is under or equal 12V, avoid excessive voltage to blow the fuse or cables.
The thermostat supplied with this kit is OE style to mount in the cylinder head of the engine or any water jacket.
Do not use tape on the sensor for may cause poor electrical contact or incorrect temperature readings.
You can crimp bigger wires to it If you intend to mount high-profile cooling fans. The 14AWG wires (15 amps) are not bigger enough for high amps draw.
Package Included
2x 40A Relay with Wiring Harness
1x 3/8" Thermostat Switch 185'F On - 175'F Off
1x 3/8" to 1/2" Adapter
2x Inline Fuse Holder
2x 20 Amp Fuse
8x Ring Terminals
4x Wire Connectors
1x Wiring Diagram
- 12 Gauge - 20Amps
- 10 Gauge - 30Amps
- 8 Gauge - 40 Amps
Features of Dual Electric Fan Relay Kit
This kit is set up to turn your electric fan on at 185 degrees and shut off at 175 degrees and will work with any 12 volt system.
It is a 3/8" pipe thread, this kit includes everything you'll need to hook up to your fan.
For the two red wires,please connect the long red wire to the battery and the short red wire to the fan.
- Fit most Rods and Classics Engines including GM (CHEVY, GMC, OLDS, CADILLAC, PONTIAC, BUICK, FORD, & MOPAR (CHRYSLER, DODGE, PLYMOUTH) , Please measure to make sure this is the right
- Work for 265 283 305 307 327 350 383 400 396 402 427 454 472 502 260 289 302 351W 347 352 360 390 406 427 428 429 460 351C 351M 400M 273 318 340 360 361 383 400 413 426W 440 455 330 326 ENGINES.
4PIN Waterproof Relay
Sealed 4 Terminals,Work In Any Harsh Conditions
20 Amp Fuse and Inline Fuse Holder
Inline Fuse Holder To Protect the Fuse Perfectly
14AWG Tinned Copper Wires
Tinned Copper wires are durable and reliable.
3/8" NPT Pipe Thread with 1/2" Adapter
Temperature 185 Degrees On 175 Degrees Off
Emmanuel
2025-08-22 15:22:31
Great product
Destinee
2025-06-14 10:21:28
Good product for the money works well on my Jeep Cherokee
Matt
2025-05-07 14:15:27
The media could not be loaded.
Susan M.
2025-04-28 12:33:38
This product work just like described. Awesome will use again
john k.
2025-04-23 17:33:30
Everything was in the kit for the installation. Looks like quality parts.
Carl J.
2025-04-20 21:55:05
I actually ordered this relay kit because I needed a pair of relays for a vehicle that I am upgrading and it was more cost effective this way. By the time I ordered relays, plugs, wire, fuse holders and connectors it would have cost must more than this kit. The components in the kit are nice quality, the wire is a heavy gauge and all the the terminations are cleanly crimped. This also saves me from having to crimp and install the wires into the plug. I like having a plug in base instead of individual connectors to connect the relays as it will be easier to mount and service in the future. Having installed dual electric radiator fans in the past, this kit has everything you need and will make the job a breeze to complete and even save you some money in the process.
Karnut
2025-03-26 18:26:28
Item was as described....Received my order on time.
Fan
2024-11-12 12:04:05
There's nothing wrong with the components in the kit; it's just the wiring has more insulation (versus actual wire) than I'd like. Considering the relays are 40 amps, there's no way the 14 gauge wires that are pre-installed would handle that kind of electrical load. Even the product page states, "If you mount high-profile fans, be sure to crimp or solder bigger wires to it since the 14 AWG wires (15 amps) are not big enough for high amps draw." So, basically plan to dismantle and re-wire the entire harness (using your own blade connectors and bigger fuses) if you're going to use larger fans. Crimping / soldering bigger wires to the 14 ga. wires of the relay harness isn't a solution; it's asking for a disaster or under-hood electrical fire with burned up wires if the pre-installed 20 amp fuse doesn't blow out in time. The thermostat switch is fine and I like how it fits two sizes with the threaded adapter. Overall, the kit is fine if you're using it for a project it can handle. I wouldn't trust it for mission critical applications like racing, but I would say it's fine on a four-wheeler or vehicle with small radiator or A/C fans.
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