hzemall

I have a LQ9 swapped in to my 79 C-10 with the Painless harness. It uses the OEM ECM and it sends out a cooling fan signal when it reaches temp and kicks on a 30 amp relay in the Painless Gen III fuse/relay box.

BUT, when it get to temp and kicks in the relay opens and closes none stop, sound like the turn signals are on.

Has anyone run into this? I can't see anything in the HP Tuner software that would make a difference with it.....

Thanks

Old Geezer

iTrader: (3)

What PCM are you using???

hzemall

i dont remember which one but its either the 89017733, 12576106 or the 12583560. Those are the ones Painless requires you to use with their harness. It's all based off of the 2002 4.8 parts I am told (ecm, tac, pedal etc)

LS1MCSS

iTrader: (18)

You do have it wired for a ground signal from the pcm, don't you?

hzemall

The painless harness takes the ground out from the ECM and runs it through the relay in the painless fuse box and give it a 30amp pos output