on a 90 it may be different spots. Try up on the firewall or the side of the cab but near the feet area. It looks like at least 91+ had them close to the door opening hinge area under plastic trim which is actually nice compared to pulling carpet on your belly or upside down with a flashlight wedged part way out of the cab to access them(cough gm) but I could see the vinyl floor trucks making it a little more prone to corrode by the doors. Easy to fix tho

 

there is a ground strap from your upper intake to the firewall, which shares a bolt with the bracket that supports the manifold. also i've seen ground straps on the hood hinges, and on the radius arm brackets, not sure these will affect anything but they're there. anyone have any info on the purpose of these?

 

I am not entirely certain, but as I understand it, having the ground strap to the hood has to do with making sure it's grounded, so you don't get RFI issues, which can potentially cause ignition weirdness, or cause radio reception issues.

 

the steel straps on body parts is for galvanic corrosion

 

If that's what they're for, they don't work very well, at least not on my '87 =P (Not saying you're wrong, you could very well be right, as to why that's why they're there.)

 

I’m guessing the body mounting and things like bushings and stuff make separate chunks of machinery that likely have circuits on them or use them as a return path and To my knowledge there will be a slight (anode scientific reaction or galvanic corrosion between presumably a light sheet metal and iron/steel..? Maybe from copper and brass idfk lol

basically the concept should be that all panels and parts are connected to the same ground appropriately and you would avoid having positive charged parts compared toeach other or something

sane idea as clean coolant so it doesn’t conduct electricity

 

This makes alot of sense, since the engine block and intake are dissimilar metals, and I can only assume the frame and suspension brackets etc may have different conductivity characteristics

 

I cleaned and re-secured that with a bigger screw on the hood end. Can't have too good of a ground anything.

I also added another ground strap between the frame rail and body on the underside. The existing ones on both sides are rusty and filthy and couldn't see any easy way to clean them. I was afraid one of them might break if I removed it. Those straps just slide on with a tooth to hold them in place. I cleaned off the paint and put the new one on with screws then sprayed a coating of the battery terminal protector on outside of all connections.

Broncobasher

 

I poked all around on the drivers side. Removed the kick panel, pulled up carpet, didn't see any ground screws other than one I added for my USB power adapter for my dash cam.

Broncobasher

 

Transmission 1995 E150 Van intermittent auto transmission shifting lurches. This is been bugging me for a few years now even after I have had the tranny looked at by a few specialists. New oil, new filter, one new solenoid…. It seems to act up more after driving on bumpy gravel roads. Sometimes when I turn off the engine for 10 seconds, it will shift properly….. I had a new ground strap attached to the tranny, May have helped for a bit. I am looking for more grounding ideas……..???? Or just ideas.

 

Great thread, and I know this thread is years old.....but I just had my Bronco painted and the security gets triggered everytime I open the door. I have read and talked to ppl who said something could get painted and the ground may not be making contact and sets off the security. So my question is....which ground is that?

Thank you

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my 1996 f150 only has a ground to radiator support on left side. Is it supposed to have one on right side of radiator ?
I have no interior or dash lights ty

 

@ @subford

You sir are a world of helpful knowledge.

I'm planning to add some extra grounds to my truck when I upgrade the alternator, and the battery terminals.

Thanks again!

 

Hey, folks, maybe an old thread but I want to follow up and ask if there's a summary for grounding strap locations on a 1990 F-150 XLT/Lariat.

I have one under the passenger's side that's broken. I'm going to be looking to find/replace/confirm tightness of others.

 

Try starting at post #3 above......