I see a lot of guess work here. START WITH SIMPLE AND FREE THINGS FIRST.
The one thing in common with those alts is the wiring. If the third alt fixed the problem, it was because disconnecting and re-connecting connector rubs off oxidation on the pins.
Toyota components are bullet-proof. Bad wiring usually causes problems. had what looked like a serious problem last week, only to find out it was a bad "S" pin connection. Fixed by cleaning and tightening connector pins.
Quote:
Originally Posted by Kanoe
Isn't there supposed to be battery voltage fed TO the alternator on one or them to make the alternator work?
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Quote:
Originally Posted by Kanoe
... I have read about broken wires right on the connector, maybe a good visual will turn up something.
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Yes this^^^
S- wire senses battery voltage. If this is broken, you would get over-voltage
IG - wire "excites" the alternator. If this is broken you will not get charging, low charge if high IG is almost broken (high resistance).
L - is merely fault light signal it will not prevent alternator from doing its job. It should be close to 12V when system is working well. Close to ero when there is a system fault.