30 other red wire needs constant 12 volt power from the battery.
Ls swap fan wiring.
86 gray white wire goes to the ignition switch.
Photo courtesy street performance.
Make sure you grab the wiring harness from the donor car.
Some 2003 ls pcm s tach signal is not strong enough and needs boosted see this link.
Comparing gen iii controllers crankshaft guide for building big inch ls engines camaro and firebird ls swap.
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If you don t you have to head back to the salvage yard or take your chances on ebay.
Looking for an affordable in stock plug and play wiring harness for your ls swap.
Psi sells standalone wiring harnesses for gm gen ii iii iv v ls lt based engines and transmissions.
You must use a relay.
Exhaust and induction guide.
Thank you to all that stuck with us during this hectic time.
You can buy a stand alone harness have a new harness custom built or rewire the harness that came with your ls engine.
It seems for many people that the scariest part of the modern engine swap is the wiring harness.
Fan controls 1 2 gm pcm s typically will control electric fans usually 2.
The pcm will supply the negative or ground signal to turn on fan relays.
85 black wire.
You can not directly connect pcm fan control wire to fans.
The dlc or obdii port is a must have for any ls swap and it is often overlooked when retrofitting a stock harness.
87 red wire connects to the positive wire on the electric fan.
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.
When you are doing a build with the ls family of gm engines the idea is to end up with a.
Your 1 source for oem operated pcm controled and universal electric fan harnesses.
Wire it once and wire it right with painless.
Wiring harness and wiring guide gm ls series pcm ecm.
Official site of painless performance american made wiring harnesses for your hot rod street rod muscle car off road and everything in between.
In most cases people end up having the harness that came with their ls engine rewired.
Camaro and firebird ls swap.