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Old 07-23-2012, 18:44   #1 (permalink)
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1991 F250 NO Brakes,NO Hazards

I just bought this truck, started troubleshooting. Tonight I finally found the hazard flasher over behind the glove box, swapped with turn flasher in the fuse panel , turn signals still work, still no hazard or brakes, before I got this far I already repalced the turn signal switch, live and learn, i could have sworn I had 12 volts at the brake stop switch before replacement, I also saw in a schematic that Fuse #1 15 amp should be hot at all times. I measured tonight and no voltage at all, pulled the fuse and checked socket with DVM on both sides to good ground, no voltage. Wondering if the mating connector for the new signal turn switch did not seat good. ??? Im close but its late and I'm tired , time to retire for the night. Any input greatly appreciated, I have a 351 Windsor , 5 speed manual, tow package, I looked very hard and did not see any fuse panel in engine compartment. I pulled and checked every fuse with ohm meter in fuse box.
Thanks all

MGM
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Old 07-23-2012, 21:42   #2 (permalink)
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Re: 1991 F250 NO Brakes,NO Hazards

Have you checked fuse L under the hood? The underhood fuse box is right behind the washer/coolant reservoir.
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Old 07-24-2012, 04:59   #3 (permalink)
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Re: 1991 F250 NO Brakes,NO Hazards

Bert, I was on the phone last night with my old friend , a mechanic that works at a Ford Garage, he asked me the same question, I saw no such box. the only box was the Towing trailer box that had the ECC plug and a couple other plugs, no fuses at all, from front to back is the washer resevoir, then the air filter, then the trailer towing setup, no fuses anywhere, I looked last night like I was painting it there but could not find ?? I could have sworn I had the 12 volts prior to putting in the new turn signal switch, ??? but now, no voltage at either side of Fuse #1 in box in cab. Thanks for your help
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Old 07-24-2012, 05:27   #4 (permalink)
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Re: 1991 F250 NO Brakes,NO Hazards

Bert, you talking about the Fusable links over by the solenoid by the battery ?
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Old 07-24-2012, 09:35   #5 (permalink)
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Re: 1991 F250 NO Brakes,NO Hazards

The 91s didn't have the extra fuse box. They started in 92. There are fusable links at the starter solenoid. The one for the brakes and hazards has yellow wires. Look around the solenoid.
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Old 07-25-2012, 05:00   #6 (permalink)
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Re: 1991 F250 NO Brakes,NO Hazards

Would you know of the size fusible link wire (gauge for these) I found them all at the starter relay. there are 2 yellow ones that branch off to 2 seperate wires, then a large green to alternator and another one too.
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Old 07-25-2012, 09:01   #7 (permalink)
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Re: 1991 F250 NO Brakes,NO Hazards

They are 20 gauge. Did you find the one with the problem?
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Old 07-25-2012, 09:10   #8 (permalink)
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Re: 1991 F250 NO Brakes,NO Hazards

Well Bert, I loosend the nut on the relay starter and the 2 spade end on the yellow wires fell right off, the other wire had a completely burned out fuse link, the green wire to the alternator was burnt and spade end fell off, I ordered some fusible link wire today and will redo the whole set of links and go from there.
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Old 07-25-2012, 09:11   #9 (permalink)
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Re: 1991 F250 NO Brakes,NO Hazards

Keep us informed. Sounds like you have it handled.
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Old 08-04-2012, 21:49   #10 (permalink)
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Re: 1991 F250 NO Brakes,NO Hazards

Bert, well , walk away, think, come back, look, etc, so tonight put up on hoist, grab ground cable from motor, was cut right off. Bought new cable tonight , will install tomorrow, am 99% sure I found problem, will let you know
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