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b alternator

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11-17-2003 10:34:41

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Is their a simple way to test the alternator on the tractor without a test devise or taking it to a parts store? Also where can one find the proper wiring diagrapm. Thanks JF

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11-17-2003 16:21:26

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Re: b alternator in reply to jf, 11-17-2003 10:34:41

If it is a Delco alternator, with engine running at half throttle, turn on all the head/tail lights, put your hand on the alternator chasis being carefull not to stick your fingers in the cooling fan, the alternator chasis should become warm to the touch. If it stays cold it is not charging. Reason the Delco alternator uses the chasis as a heat sink for the solid state rectifier/regulator and as current flows thru rectifier the chasis will heat up.

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Red Dave

11-17-2003 10:45:04

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Re: b alternator in reply to jf, 11-17-2003 10:34:41

Well, if it has an alternator, it's not an original. It would have come from the factory with a generator and a cutout relay, 6 volts, positive ground.
To test the original system, ground the "F" terminal of the generator with the engine running at about half speed. If it starts to charge, the generator is good, look at the cutout or elsewhere for the problem. If it doesn't charge, good chance the generator needs work.
The service manual will have a wiring diagram.

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11-17-2003 11:02:52

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Re: Re: b alternator in reply to Red Dave, 11-17-2003 10:45:04

Sorry should have stated it is retrofitted for a 12 volt system

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Red Dave

11-17-2003 11:47:58

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Re: Re: Re: b alternator in reply to jf, 11-17-2003 11:02:52

In that case, measure the battery voltage with the engine stopped, it should be 12.2 - 12.6 volts.
Start the engine and measure it again, it should increase to 13.5 to 14.5 or so, if it's doesn't, the alternator isn't charging the battery.
Does it have an internal or external regulator? If it's external, it may be the culprit.

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Dave_D

11-17-2003 13:33:26

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Re: Re: Re: Re: b alternator in reply to Red Dave, 11-17-2003 11:47:58

Also if its external regulated, they make a nice electronic external regulater that will never need adjusting. I got mine a local autoparts (AutoZone).

Dave
Chico, TX

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andy

11-17-2003 13:58:44

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Re: Re: Re: Re: Re: b alternator in reply to Dave_D, 11-17-2003 13:33:26

if its a delco alternator put a screw driver on the back bearing plate if it sticks its charging

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