Hi,

I have a 1993 F350, with 7.5L.

Yesterday I smelled a burning smell and noticed the alternator wiring was fried. Its the stud that cooked, the pig tail is OK. Today I got a new alternator and spliced in all new wiring going back to the fusible link to the fender mounted relay.

After every thing was done I tried to hook up the battery cable and it shorted in a bad way. In trying to eliminate the cause I disconnected the wires from the stud at the back of the alternator and there is no more short, but I can't drive it like this because the battery is not being charged. I am sure I did the connections right. The wires were tight.

Can a bad relay cause this, or is the problem somewhere else. The truck will start and drive without the alternator wiring hooked up.

Thanks

 

Well, it looks like the wire on the stud was contacting the alternator casing and causing a massive short. Re-did that and it's fixed.