Alternator test - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 09-23-2001, 09:44 AM
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Alternator test

CAn I test my alternator while its mounted on the Jeep? I thought of connecting my volt meter to the positive terminal, but wondered about the battery's affect? What's the deal?

Ron

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post #2 of (permalink) Old 09-23-2001, 10:01 AM
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Re: Alternator test

A volt meter will tell you if its dead as a doornail as they say.. but it won't test if it can actually put out any amps. The auto parts stores around here (autozone, advance) will test them in the vehicle, for free.


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post #3 of (permalink) Old 09-23-2001, 10:08 AM
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Re: Alternator test

The autoparts store will put the alternator in a "Growler." This will not only test the output, but the regulator (if internally regulated) but the bearings as well. The tester should vary the speed of the spin. This will test the bearings. All in all, take the time to remove the alternator and have it tested... then you know what's right, and what's wrong.

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post #4 of (permalink) Old 09-23-2001, 11:19 AM
 
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Re: Alternator test

a simple check with your meter ( if its digital)
is to check voltage across the bat terminals with the key turned off.

then check again with the engine running, it should be higher with the engine running, around 14.4 volts



OzarkJeep

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