1979 F250 electrical problems
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Okay, more info...here we go. The truck was running normally, for the most part. The lights on the plow went out. The main lights worked and then the wipers started to double time the volume on the radio went to 10 and then the engine started missing (for about 10-15 seconds) and then everything went out. EVERYTHING . I have 2 new battaries and all of my fuses are good. I did smell the electrical burn briefly but did not see any smoke. Is there something under the dash that i can check or under the hood? I jumped the sol and the engine cranked but did not push it any farther.
Tuned
Joined: Mar 2004
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When you jumped the solenoid and the negine cranked, did your lights still not work? Was it trying to crank without anything else working? If so, the solenoid may be bad. The battery hooks to the solenoid, then to the rest of the truck. If that goes out, everything dies.
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Originally Posted by kc5hwb
When you jumped the solenoid and the negine cranked, did your lights still not work? Was it trying to crank without anything else working? If so, the solenoid may be bad. The battery hooks to the solenoid, then to the rest of the truck. If that goes out, everything dies.
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The battery hooks to the solenoid, then to the rest of the truck. If that goes out, everything dies.
But it is a connection point that powers the whole truck. In the diagram below, point #3 has a smaller wire connected to it. This is the one that powers the whole truck. Follow it down a little bit, and you may see a small rubber thing in the wire. This is a fusible link, and it may be burned out. Keep following the wire, and you may find more wires with fusible links in them.
If you get it going, carefully measure the voltage at the battery, and try not to rev the engine. If it is way over 16 volts, you need to check the wiring around the alternator and the regulator.
If the truck has power, but won't fire, the high voltage spike you experienced may have burned out the ignition module.
