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Discussion Starter · #1 ·
Anyone on here know a way at home to check the health of an alternator?

My '91 sometimes has trouble starting on the first try, then when it does start I notice the volt meter on the guages reading low (~10 V) for awhile then all of a sudden (usually after reving it a bit) picks up to normal. It is fine after that. The alternator is my first suspect.

The only test I've seen on other sites are just load tests where you start the truck, take a voltage reading then start adding loads (like headlights, etc) and watch for any voltage drops. The voltage should stay the same.

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