Re: Test Alternator Output

Posted by Bob M on August 08, 2006 at 08:21:33 from (151.190.254.108):

In Reply to: Test Alternator Output posted by DelMN on August 08, 2006 at 06:49:02:

Del - First NEVER remove the big wire from the alternator and run the engine! That's a good way to fry the alternator or regulator...

If you have a voltmeter, IH2444's test below is a good one.

However if you don't have a voltmeter there's a "full field output" test you can run requiring only the tractor's ammeter and a screwdriver:

First look on the back of the alternator for a 3/8" dia round (or sometimes D-shaped) hole. About 1/4" inside that hole find a small metal tab. The tab is the regulator bypass terminal - grounding it causes the alternator to go to maximum current output.

To test, with the engine running at about 2/3 throttle take a small screwdriver and touch the blade to the tab while grounding the side of the screwdriver against the edge of the hole. If the alternator is good it should peg the ammeter on the charge side (+20 amps) when the metal tab is grounded.

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