Ls Swap Electric Fan Wiring

When you are doing a build with the ls family of gm engines the idea is to end up with a.

Ls swap electric fan wiring.

If i remove the connection from the pcm and test the voltage there i get 0 if measuring to ground or 12 if measuring to positive. Electric fan wiring for proper electric fan control when the a c is on the best pcm and calibration choice is 1999 2002 camaro firebird corvette. The pcm is sending a ground signal to the relay but the relay is not activating. A relay kit our part number ccfkrl will include everything you need to properly wire up your electric cooling fans with the exception of additional wiring needed to complete all of the circuits.

Lt1 ls1 05 oem flex a lite universal street strip we have you covered. In these vehicles the pcm receives a 12v request from the control head checks the refrigerant pressure activates the compressor clutch relay and monitors the voltage on the compressor clutch to. 85 black wire. The first part of the installation is to install the electric fan to your radiator and remove the mechanical fan.

Some 2003 ls pcm s tach signal is not strong enough and needs boosted see this link. The pcm will supply the negative or ground signal to turn on fan relays. It seems for many people that the scariest part of the modern engine swap is the wiring harness. I am working on a ls swap and i cannot get the cooling fans to work.

You can not directly connect pcm fan control wire to fans. In this way the electric fan motors are wired in parallel causing the fan motors to spin at high speed. When the pcm triggers the two additional relays the same voltage flows through each electric fan motor. Fan controls 1 2 gm pcm s typically will control electric fans usually 2.

When i measure voltage at the relay i get 12v on both sides of the coil. 30 other red wire needs constant 12 volt power from the battery. The fan s are triggered via a temperature switch and 40 amp relay combination. We are currently up and running and shipping from our new location.

87 red wire connects to the positive wire on the electric fan. 86 gray white wire goes to the ignition switch. In this way the electric fan motors are wired in a series and voltage is reduced causing the fan motors to spin at low speed. Also included is an easy to follow wiring diagram.

Thank you to all that stuck with us during this hectic time. You must use a relay.