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'86 F250 continuing problem

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Posted by Slowpoke on January 24, 2007 at 01:37:51 from (

I bought a running (at the time) '86 F250 Super Cab, 7.5L. I only ran the engine for a couple of minutes. It was towed home 60 miles due to expired registration. I replaced the ratty battery cables and damaged starter solenoid on the fenderwell. First time to start, engine fired and died, and the 16ga fusible link connected to the solenoid battery terminal burned out. I believe the link goes to the key switch. No power or lights. I replaced the link, and after about 30 minutes noticed the alternator getting warm. I had the alternator tested and it was fried, so I replaced it. Tried again, key on, have power and lights, cranks OK, engine fired and died, instantly burned out fuse link again. I have not checked alternator yet. The Ford wiring diagrams are the pits. Any ideas where the short is and why it seems to occure when the engine starts?

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