93 f-250 electrical issues
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Cross-Country
Joined: Nov 2020
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93 f-250 electrical issues
Hi, I bought a 93 f250 5.8 and have been fixing it up one problem at a time. The electrical issue I’m having is when the truck is running the needles of the oil pressure and voltage gauge are acting up. The more power I draw (lights, heater blower) the oil pressure gauge jumps higher and the volt gauge drops lower. Now I know the oil gauge is a dummy gauge so it’s just reading different voltage. I have checked the voltage at the battery. Not running I have 12.5 and running I have just over 14. Turning my lights on or turning the blower on doesn’t effect voltage at battery so I am assuming the charging system is fine. I am getting ready to start checking wires and grounds, but I wasn’t sure if maybe this was a bigger problem. The idle also sometimes drops lower when I draw more power sometimes to the point where is wants to stall at idle.
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Cross-Country
Joined: Nov 2020
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Yes I did. Turned out to be a grounding issue. I learned that the oil pressure gauge is more of a dummy gauge. Once the pressure sensor hits a certain amount of pressure it sends a signal to the gauge. The gauge isn’t reading actual pressure. These trucks are known for their issues with bad grounding so I ran two new grounds from the battery. One to the frame and one to the cab. And that corrected the problems I was having.
Lead Driver
Joined: Jun 2021
Posts: 5,221
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Yes I did. Turned out to be a grounding issue. I learned that the oil pressure gauge is more of a dummy gauge. Once the pressure sensor hits a certain amount of pressure it sends a signal to the gauge. The gauge isn’t reading actual pressure. These trucks are known for their issues with bad grounding so I ran two new grounds from the battery. One to the frame and one to the cab. And that corrected the problems I was having.
Thread Starter
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Cross-Country
Joined: Nov 2020
Posts: 66
Likes: 7
Bear with me here I did this a couple years ago and I no longer have the truck.
I went to the local auto parts store and picked up a couple pre made grounding cables you can get various lengths of. The one to the frame I just found an existing hole along passenger side of frame, wire wheeled the area around the hole to remove paint and rust, and bolted it there.
For the cab ground I believe I ran it just to an existing spot where there was already a grounding cable but my memory is hazy on that one. And mind you before doing this I would inspect and clean all existing grounding cables first to see if that helps.
I went to the local auto parts store and picked up a couple pre made grounding cables you can get various lengths of. The one to the frame I just found an existing hole along passenger side of frame, wire wheeled the area around the hole to remove paint and rust, and bolted it there.
For the cab ground I believe I ran it just to an existing spot where there was already a grounding cable but my memory is hazy on that one. And mind you before doing this I would inspect and clean all existing grounding cables first to see if that helps.
Lead Driver
Joined: Jun 2021
Posts: 5,221
Likes: 805
Bear with me here I did this a couple years ago and I no longer have the truck.
I went to the local auto parts store and picked up a couple pre made grounding cables you can get various lengths of. The one to the frame I just found an existing hole along passenger side of frame, wire wheeled the area around the hole to remove paint and rust, and bolted it there.
For the cab ground I believe I ran it just to an existing spot where there was already a grounding cable but my memory is hazy on that one. And mind you before doing this I would inspect and clean all existing grounding cables first to see if that helps.
I went to the local auto parts store and picked up a couple pre made grounding cables you can get various lengths of. The one to the frame I just found an existing hole along passenger side of frame, wire wheeled the area around the hole to remove paint and rust, and bolted it there.
For the cab ground I believe I ran it just to an existing spot where there was already a grounding cable but my memory is hazy on that one. And mind you before doing this I would inspect and clean all existing grounding cables first to see if that helps.
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