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So my 88 F350 with a 7.5 died the other day shortly after starting. Literally nothing electronic ic works, not even the courtesy lights don't work. I replaced the starter solenoid and checked the battery and still nothing. If I bridge the S terminal and the starter terminal on the solenoid it turns over fine and electronics start working. Here is a picture of the solenoid wiring.
Well, your pic is zoomed way in, so can't see what's around it... The two big studs on the Starter RELAY... the stud on the Left, is that the heavy gauge wire that runs from the battery? If so, then it looks like all the fusible links are on the wrong big stud. The fusible links should always be getting battery power (not only when the Starter Relay is energized!), so they should be sharing the stud that is always connected to the battery.
Ok so everything was going great except the timing was off so I was about to retime it but I turned it over and just heard a click and the whole truck died. I made sure the battery was charged and the same thing happened. Every time I attempt to start it I have to disconnect the negative terminal on the battery or nothing works.
Ok so everything was going great except the timing was off so I was about to retime it but I turned it over and just heard a click and the whole truck died. I made sure the battery was charged and the same thing happened. Every time I attempt to start it I have to disconnect the negative terminal on the battery or nothing works.
So you attempt to start it, no go, then no dome light at all, and then if you disconnect and then reconnect the negative battery cable again, you get the dome light to go on?
If that is what is happening, and the battery is at least at reasonable charge level, I would shine up both the battery's negative terminal, and the inside of the terminal clamp. Also inspect the neg battery cable to terminal clamp area... wiggly? broken wire strands? Inspect negative battery cable from clamp to grounding point, including the small black wire from battery terminal clamp to body ground, if your neg cable has that second wire.
Looking for any source of a high-resistance condition in the negative lead area. A high resistance there can heat up and really go to a high resistance, too high for even light loads, much less the heavy load of the starter.
Disconnecting the negative battery cable may be wiping, or flexing, the high resistance problem point just enough to get SOME current through, before you heat it again with starter load.
Just a thought. Oh... also take a look at the negative post on the battery itself... it's not loose in the battery case, is it?
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