Hilux808

I was wondering if anyone knows of a ground wire that's attached to the body/radiator support and for what circuit/device is it grounding? The color of the wire I believe is yellow and green and it bolts to the front of the truck just to the right of the radiator but behind the grill. It looks like someone took some sandpaper to the paint; makes me wonder if it came like this from the factory. I figured it might be for the condenser fan but the fan wires have different colors so I'm not sure. I wish i had a picture but I don't. Anyone know?

xzyragon

either AC or lighting. I dont have an AC and my lights dont work, and i dont have that ground, so im only spitballing here

Hilux808

Hmmm, I've talked to 4crawler a few times concerning where the ground is for the headlights of our 2nd gen 4runners and I still have not been able to find it. I wonder if that could be the wire? Maybe parking lights or turn signals?

Tubbyfatty

I think i know what your talking about. theres 1 on each side of the truck?

Hilux808

I only found one on my truck. I didn't see any on the other side towards the battery. You have 2??

Hilux808

anyone?

Tubbyfatty

YEa i might be thinking of the wrong thing. heres a pic.

Of course behind the bumper.

qdude79

Shot in the dark: my old F-word was known to have problems with electrolysis. Grounding the radiator, aside from annual coolant changes, was the answer. I'm told that the heads on the 22RE suffer from this, caused a lot of "pitting" along the head surface. Because of this, Toyota put a ground on the back of the head as well. When I got mine, there was no such ground. Guess what: pitting on the surface. I've got a ground on it after a rebuild, as well as the radiator.

I don't know if this is what your ground is for, but it's possible. Can't hurt to add extra grounds, right???

Hilux808

What is your F-word?? I just recently had a big lesson in electrolysis. I actually lost 2 cylinder heads to it. After I realized this was the problem I have since installed numerous ground straps throughout the truck engine/trans/transfer/body/frame and 95% of them are 4GA wire. The factory 8GA on the rear of the head to the firewall wasn't cutting it for my MSD setup. I also have a 4GA on the front hook on the head going straight to the negative terminal. I've just been schooled in a very expensive lesson and I don't plan on having come back to haunt me.

Every vehicles cylinder head has to have a ground for the secondary side of the ignition/spark plugs. I've read articles suggesting not to ground radiators, heater cores or to ground accessories to radiator supports as this only furthers electrolysis problems. Besides the radiator bolts right to the support, it's grounded very well becasue of that. You want current to find it's way back to the negative terminal through a conductor and not the coolant.

I'm not so sure this is a factory ground just for the radiator support, I think it's for some device although I don't have a reference to tell me what color wire goes to where. What ever it is I rewired it to a ground strap I have in place on the frame. I don't want any grounds on the radiator support.

I hope to soon write an article on my experience to warn others.