Does anyone have a diagram of the wiring in the front compartment? My factory service manual has everything but this. My reason is to find a wire to tap into that's (1) ignition switched, (2) off when in accessory position and (3) can handle about 55-60 watts extra draw on the wire.

I could also use a fuse tap to use in my fusebox if anyone has one to spare. I can't find one in any stores around here!

Hi, Not sure about the 50-60 watts part--but you can tap the dark green with wht stripe wire, its a key on key off wire I use to turn on the rad fan up front on a 3800SC.

I think that if this wire can power your rad fan, it can probably handle my 2 light bulbs. Thanks.

We're talking about the wiring bundle that goes past the brake master and goes under the left headlight, right? C100, IIRC.

Then hold the phone! The dark green wire with the white stripe is meant to power the radiator fan relay! That wire will only be active if the temperature switch or the A/C selector says the fan should be running.

To run my under-hood air compressor, I tapped the brown wire with the white stripe to a relay, and then tapped the great big red wire for the actual current. That wire is meant for big amps (it's the one that's supposed to power the actual rad fan), but it's live 24/7. The brn/wht is only live when the key is on. I can't recall if it's live in acc, but it's as close as you're going to get under the hood.

3800superfast, I hope you meant to say you use it to go to the rad fan relay. If you run your rad fan through it, you're pulling a lot of amps through an engine sensor! I'm surprised you don't blow a fuse.

Thanks for the info, Badger. Will the Brown w/ White stripe wire handle the additional load of the front light bulbs for a DRL conversion? I'll check my factory manual again....

My factory manual has some diagrams for the turn signals, headlights, and headlight motors... but Pontiac has no purty picture of the harness under the front hood with descriptions of every wire by color like there is for every other harness in the car

[This message has been edited by FieroGT42 (edited 04-19-2006).]

quote Originally posted by FieroGT42: Thanks for the info, Badger. Will the Brown w/ White stripe wire handle the additional load of the front light bulbs for a DRL conversion? I'll check my factory manual again.... My factory manual has some diagrams for the turn signals, headlights, and headlight motors... but Pontiac has no purty picture of the harness under the front hood with descriptions of every wire by color like there is for every other harness in the car

Sorry it took so long to reply. No, it will not handle that load. You should use a simple relay as described above.

quote Originally posted by 3800superfast: Hi, Not sure about the 50-60 watts part--but you can tap the dark green with wht stripe wire, its a key on key off wire I use to turn on the rad fan up front on a 3800SC.

I could be wrong, but the green wire with the white stripe is a ground wire and if you ground it, then it will turn on the rad. fan. I picked up a solid red wire in the same location as the green with white stripe.
It is hot with the switch on. To be safe, run a in line fuse to your project.
Don

Ok, Now I must be missing something---I notched (not cut) the green/white wire up front, then ran a ground from it to the bottom hood strut bolt to ground it. It does not turn the fan on then---**unless I turn the key on**, then when I turn the key off the fan turns off. This is a 88GT 3800SC and have seen alot of conversions use the same method, actually 2 of the big conversion guns are the ones who suggested this method. What am I missing on this ? Its pretty much the same as grounding the fan/rad switch connector at the rear of a 2.8 and having the fan kick on to see if you have a bad relay or switch. Heres some diagrams though for you. Still curious on the above ? LMK Thanks

http://home.att.net/~subzero350/

http://www.euronet.nl/users/fo_elmo/wiring.htm

My results:

I used the brown with white stripe, works perfectly: Lights come on only in run and start positions, not accessory. They also go out when cranking the engine. Nothing has burst into flames yet.

The solid brown "floating ground" splits into 4 wires shortly after it comes out of the firewall (closer to the A/C). This is also where the light blue (left turn) and dark blue (right turn) split into 2 wires each. It doesn't matter which solid brown, Lt blue, or Dk blue wire you use as long as you check continuity to make sure it's one of them that splits from the single wire which feeds through the firewall. Obviously, it shouldn't matter which true ground wire you tap into.