Ls Swap Dual Electric Fan Wiring

87 red wire connects to the positive wire on the electric fan.

Ls swap dual electric fan wiring.

Upgrading to gen iii ls series pcm. You can not directly connect pcm fan control wire to fans. 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. Thank you to all that stuck with us during this hectic time.

Fan controls 1 2 gm pcm s typically will control electric fans usually 2. 85 black wire. 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. Psi sells standalone wiring harnesses for gm gen ii iii iv v ls lt based engines and transmissions.

Wiring dual cooling fans. Crank spacer is a bit of a misnomer. When the pcm triggers the two additional relays the same voltage flows through each electric fan motor. Https amzn to 377klrp those fans fit perfect on 68 72 gm a body cars bu.

This applies to all transmissions that were originally used prior to the introduction of the ls platform around 1999. We are currently up and running and shipping from our new location. With dual cooling fans there are two methods for wiring up the relay kit. Your 1 source for oem operated pcm controled and universal electric fan harnesses.

Electric fan guide 100 horsepower anybody can install in gen 3 ls. In this way the electric fan motors are wired in parallel causing the fan motors to spin at high speed. You must use a relay. Just an idea on how to wire up electric cooling fans for your vehicle cooling fans.

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. 86 gray white wire goes to the ignition switch. The wiring aspect of any ls swap is undoubtedly the most difficult. The pcm will supply the negative or ground signal to turn on fan relays.

Lt1 ls1 05 oem flex a lite universal street strip we have you covered. 30 other red wire needs constant 12 volt power from the battery. Some 2003 ls pcm s tach signal is not strong enough and needs boosted see this link.