Those cars have triplet battery cables, meaning that there are three cables
going to the positive battery terminal. Corrosion can build up inside those
cable terminals, causing occasional or intermittent isolation.
And, you can't tell by looking. You have to open them up and inspect them
This is where I would start
Battery cables will not do that if the alternator is still working.
Everything would seam fine until he shut the car off. Then it would just
not start. I have removed batteries with the car running and the car
continues to run. A heat related problem in the engine control module would
kill the engine, but would not account for the other electrical failures.
If you had BOTH problems, that might explain your symptoms. The easiest
way to check for corrosion in a wire is to disconnect one end and use an ohm
meter. If the wire inside the insulation is corroded, the resistance will
be high. On a battery cable, there should be less than 2 ohms resistance.
If the meter says K ohms, replace the wire immediately.
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