1990 F250 electrical problems
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7th Gear
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1990 F250 electrical problems
My 1990 F250 has electrical problems after changing the battery. The truck runs, the head and tail lights work, the dash instuments work. However the power windows, windshield wipers, radio and fan now don't work. I am also getting a warning light on the dash saying the rear anti-lock brakes are not working. Any ideas as I am at a loss.
Fleet Mechanic
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Everything worked just fine before changing the battery? Double check you have the ground to core support and chassis hooked up and tight. Did it spark real good when you hooked up the new battery? Check those fuses also.
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7th Gear
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I have looked for the fusablke links, none found. I have looked at the fuse box and the fuses and they are all good. The wibdsahield wipers radio and power windows still don't work. I am at a total loss. Though the head lights, turn signals and tail and stop lights work, and the engine starts and runs. Oh and the dashboard guages work.
Last edited by pjcs; Dec 27, 2025 at 08:37 PM.
Fleet Mechanic
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The fusible links are the smaller wires on the starter solenoid. You checked all the fuses in the fuse box (driver side under dash)?
you said that already, disregard.
you said that already, disregard.
Last edited by 90project5.0; Dec 27, 2025 at 09:08 PM.
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Cargo Master
Joined: Aug 2021
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From: Maryland
I have looked for the fusablke links, none found. I have looked at the fuse box and the fuses and they are all good. The wibdsahield wipers radio and power windows still don't work. I am at a total loss. Though the head lights, turn signals and tail and stop lights work, and the engine starts and runs. Oh and the dashboard guages work.
The other commonality of these circuits is the ignition switch. What were the symptoms that led to replacing the battery? Were you having electrical issues?
Here's an in depth thread with a disassembled ignition switch. Replacement doesn't require this much disassembly though.1987+ Ford F150 Ignition Switch Basics - Ford Truck Enthusiasts Forums https://share.google/fRAVhZ8aaFAckEkOB
They're known to separate and cause issues. The switch can be accessed by lowering the steering column, but if you do get to that point, and your truck is an automatic, disconnect the gear indicator cable so it doesn't get damaged.
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Cargo Master
Joined: Aug 2021
Posts: 2,253
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From: Maryland
Was the switch coming apart? Was it obviously the issue? I would go to a website like rock auto and look for a quality replacement, or to your local auto parts store, and do the same. Don't cheap out on it.
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3BadBirds
1987 - 1996 F150 & Larger F-Series Trucks
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Dec 25, 2006 08:21 AM