Originally Posted by Alex98
What numbers should I be looking for at which rpms? I'm gonna have it tested pretty soon. It blows intermittently sometimes it's a couple days or even sometimes a week or so. It's only blows engine running then the battery light comes on. So it just stops charging the battery.
The best idea is to start at either a garage with an alternator/battery tester to test these components under load or at an auto parts store but I think you will have to take the alternator out.
Once you have determined that your alternator and the battery are good, no bad cells in the battery, then you can proceed to checking out the wiring.
BUT since it shorts over time not right away, as the others have stated it is probably a back alternator, partially shorted or just getting dirty inside and will need to be replaced. Get it tested first and then decide.
Don’t waste your time trying to determine what amperage at what rpm, just take it there and get it done.
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