xssive

iTrader: (123)

Anyone know the wire coloring on the stock fan harness? There is a black, white, light blue, and grey wire. Which are the fan speed signals and which are grounds?

xssive

iTrader: (123)

Anyone know the wire coloring on the stock fan harness? There is a black, white, light blue, and grey wire. Which are the fan speed signals and which are grounds?

WILWAXU

iTrader: (6)

One of these threads should help:
https://ls1tech.com/forums/generation-iii-external-engine/210934-anybody-know-how-make-manual-fan-switch.html
https://ls1tech.com/forums/generation-iii-external-engine/206324-how-do-you-make-fans-run-high-speed-all-time.html
https://ls1tech.com/forums/generation-iii-external-engine/195899-fan-mod.html
https://ls1tech.com/forums/generation-iii-external-engine/214112-auto-fan-switch-mod-opinions.html
https://ls1tech.com/forums/generation-iii-external-engine/111815-write-up-plug-fan-mod.html
https://ls1tech.com/forums/generation-iii-external-engine/91633-diy-manual-fan-switch.html

WhiteBird00

iTrader: (4)

Black = direct to ground for right fan, ground for left fan through fan relay #3
White = power for right fan from fan relay #2 and fan relay #3
Light Blue = power for left fan from fan relay #1
Gray = output from left fan which goes to either the right fan or to ground depending on the activation of fan relay #3