ignition controlled ground - stock tune
10-22-2006, 03:12 PM
#1
ignition controlled ground - stock tune
I've made my own harness for use with the LS1/LT1 fans. I'm looking for a ignition controlled ground thats under the hood and in the fuse box. Can anyone point one out for me.
I'm trying to get around having to pay $100 bucks for a harness, and then another $75-$300 for a coustom tune. So far I've made my own harness, just like the other guys sell. Now I need a ground that comes on with the ignition. Any help would be nice.
I'm trying to get around having to pay $100 bucks for a harness, and then another $75-$300 for a coustom tune. So far I've made my own harness, just like the other guys sell. Now I need a ground that comes on with the ignition. Any help would be nice.
10-22-2006, 04:59 PM
#2
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I just used a test light and turned the ignition on and off while backprobing leads under the fuseblock. Look for pink or red leads....mine was pink. Its just used as a trigger anyways to tell the fans when the truck is on/off. not for any real power source...at least if your using a FAL VSC.
10-22-2006, 05:43 PM
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sorry read it wrong....there are no ign. controlled grounds on this truck that I know of. There are things controlled by ground, but none that I can think of that happen to be ign. controlled (basically I mean non-grounded when off, grounded when on right?) How are you controlling these fans? FAL - Flex-a-Lite.
10-22-2006, 08:53 PM
#5
Originally Posted by bigredexpress99
. . . basically I mean non-grounded when off, grounded when on right? . . .
Originally Posted by bigredexpress99
How are you controlling these fans?
here's the diagram.
Last edited by Tootall; 10-22-2006 at 08:55 PM. Reason: added low descrip.
10-22-2006, 08:57 PM
#6
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oh so your looking for the wire to switch the fans to high when a/c kicks on. its under the fuse block. Look for the a/c relay, and figure out which of the 4 pins is the ground switched side, and your golden. I just back probed and turned on the truck and a/c and found the pin that way. If I had my wiring diagrams here, I could tell ya which pin it was, but don't. you have a 1 in 4 chance, sooooo. yeah.
10-22-2006, 08:59 PM
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ya know, if your gonna wire it to have the computer use it, ya should just do it the way GM designed it, so you can get full functionality.....check this out. https://www.performancetrucks.net/fo...2&page=4&pp=10
You can control tons of parameters in the PCM if you set it up like this. Your way kinda limits you.
You can control tons of parameters in the PCM if you set it up like this. Your way kinda limits you.
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10-22-2006, 09:00 PM
#8
Originally Posted by bigredexpress99
oh so your looking for the wire to switch the fans to high when a/c kicks on. its under the fuse block. Look for the a/c relay, and figure out which of the 4 pins is the ground switched side, and your golden. I just back probed and turned on the truck and a/c and found the pin that way. If I had my wiring diagrams here, I could tell ya which pin it was, but don't. you have a 1 in 4 chance, sooooo. yeah.
I'm able to have the fans kick on with a/c just fine. I'm guessing that I need to switch the constant "run" wire to the ignition, and relay it.