05+ electric fan wiring
#1
05+ electric fan wiring
Hey,
Installing a 5.3 into a 91 rcsb c1500. I am using a psi harness and 02 pcm. I came across some 05 truck fans that I have mounted in. I however did not grab the factory harness for them. I have seen some aftermarket harnesses and such and read that the factory harness needed additional work for the ac trigger. But most of these were 99-04 guys mounting in there factory trucks. I am not running ac. In my situation if I can get the factory harness will it just be a matter of wiring it into the correct pcm pins and having the pcm tuned? Anything to be aware of for a basic install with no ac?
Thanks!
Installing a 5.3 into a 91 rcsb c1500. I am using a psi harness and 02 pcm. I came across some 05 truck fans that I have mounted in. I however did not grab the factory harness for them. I have seen some aftermarket harnesses and such and read that the factory harness needed additional work for the ac trigger. But most of these were 99-04 guys mounting in there factory trucks. I am not running ac. In my situation if I can get the factory harness will it just be a matter of wiring it into the correct pcm pins and having the pcm tuned? Anything to be aware of for a basic install with no ac?
Thanks!
#3
TECH Regular
iTrader: (3)
Yes, if you find the stock harness its plug and play (minus repinning 2 wires which is no big deal) and then a tune. I did that to my 95 with an 01 PCM. I will be running A/C, but that is also no big deal just a relay to ground one of the wires when the A/C request kicks on.
#4
TECH Senior Member
iTrader: (5)
You lose the auto recirc feature on the ac systems. Not running ac so you should be fine.... Just get factory harness and add the two pins to the pcm connectors and get tune to turn em on and youll be good...auto recirc just gave fresh air when ac was off, actually kind of annoying actually
#5
TECH Regular
iTrader: (3)
You lose the auto recirc feature on the ac systems. Not running ac so you should be fine.... Just get factory harness and add the two pins to the pcm connectors and get tune to turn em on and youll be good...auto recirc just gave fresh air when ac was off, actually kind of annoying actually
#6
TECH Resident
iTrader: (26)
I made my own 2 relay harness for pretty cheap. both fans operate via pcm on high. I have no ac as well. But i noticed on mine that when i start the truck they are off for a few seconds thin come on. So i checked the wiring and the pcm is grounding the fans to come on. I thought mine was tuned for them. is that pin for fans automatically grounded when the pcm is not tuned for fans? I thought it was supposed to ground to turn them on. Mines is grounded as soon as it starts up.