Fan clutch?

[Lonestar10]

you can splice a wire into the fan solenoid but i beleive the truck will throw a code every time you use it im not sure if its ECM or BCM that needs to be reprogrammed or tapped into to do it perfectly.

the solenoid always has + the BCM/ECM grounds it to turn on the fan so you would run a 2nd ground wire to it.


another way to get around this would be install a second solenoid after the trucks OEM one and you can choose how to wire this one either constant + or constant ground with the switch engaging the opposite. this way the ECM wouldnt know the fan is being turned on and the ECM/BCM solenoid would continue to work as normal for fan engagement.

only problem with installing another solenoid or installing a controllable ground without going through the ECM/BCM is that the fan clutch will not shut off at certain rpms that can cause the fan to self destruct if you accidently over spin the engine.