Ls Swap Dual Electric Fan Wiring

Wiring dual cooling fans.

Ls swap dual electric fan wiring.

Just an idea on how to wire up electric cooling fans for your vehicle cooling fans. Psi sells standalone wiring harnesses for gm gen ii iii iv v ls lt based engines and transmissions. Https amzn to 377klrp those fans fit perfect on 68 72 gm a body cars bu. Thank you to all that stuck with us during this hectic time.

This applies to all transmissions that were originally used prior to the introduction of the ls platform around 1999. Some 2003 ls pcm s tach signal is not strong enough and needs boosted see this link. 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. Most builders are familiar with fabrication techniques trouble shooting and parts swapping to make things work but electronics rise to a much higher level of complexity.

You can not directly connect pcm fan control wire to fans. 86 gray white wire goes to the ignition switch. This is based on the draw from the fans if the fans are larger and draw more than 15 amps each it s recommended to install a second relay kit as shown below. Your 1 source for oem operated pcm controled and universal electric fan harnesses.

You must use a relay. 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. So your th350 th400 700r early 4l60e early 4l80e etc will need to have one of these crank spacers.

87 red wire connects to the positive wire on the electric fan. Upgrading to gen iii ls series pcm. With dual cooling fans there are two methods for wiring up the relay kit. 30 other red wire needs constant 12 volt power from the battery.

Electric fan guide 100 horsepower anybody can install in gen 3 ls. These harnesses include the gen ii lt1 lt4 gen iii 24x ls1 ls6 and vortec truck engines as well as gen iv 58x ls2 ls3 ls7 vortec and gen v lt. Crank spacer is a bit of a misnomer. In this way the electric fan motors are wired in parallel causing the fan motors to spin at high speed.

The pcm will supply the negative or ground signal to turn on fan relays. We are currently up and running and shipping from our new location. 85 black wire.