how do i test for bad alternator??
11-22-2002, 07:56 PM
#1
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how do i test for bad alternator??
easy question....how do i test for a bad alternator?? i have a multimeter. what do i put where, and what should readings are good, ok, bad???? run car when testing?? thanks guys
11-22-2002, 08:11 PM
#2
Put the meter on the battery terminals. You should see about 12.6V with the engine off, 14.0V with the engine idling, and 14.4V with the engine at 2000RPM. To do a simple load test: Run the engine at 2000RPM and have someone in the car run as many power accessories as possible. If the voltage level drops more than 1-1.5V, the alternator is bad.
11-23-2002, 01:19 AM
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someone told me this one time when the car is running take a wrench and put the head next to the alternator and if it is attracted to the alternator like a magnet then it is good.
now this is just "backyard" mechanic stuff and don't quote me on it, I would get the sucker tested at autozone for free.
BTW the above thing DOES work with a good alternator, I never tested it on a bad one.
later
biker
now this is just "backyard" mechanic stuff and don't quote me on it, I would get the sucker tested at autozone for free.
BTW the above thing DOES work with a good alternator, I never tested it on a bad one.
later
biker
11-23-2002, 01:39 AM
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I wouldn't go sticking anything on the alternator. Just remove it and have it tested for free at a local auto parts chain store. If your alternator is bad you may want to have your battery tested as well. A bad alternator can kill a battery, and vice versa. It's best to have both in good condition if you want the longest life possible.
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