Re: Checking a generator

Posted by Bob on June 19, 2004 at 19:22:15 from (66.163.134.177):

In Reply to: Checking a generator posted by Joe on June 19, 2004 at 17:50:41:

A 12 volt battery, after sitting a few hours, will show about 12.5 volts. To charge the battery, the generator output needs to be in the 13.5 volt to 14.5 volt range, as controlled by the voltage regulator.

Although some will argue with this advice, it is best NOT to be pulling the battery cable off with the tractor running.

Check the battery voltage with the tractor revved up to 3/4 speed or so. If the battery voltage is below the range I've listed, check right at the generator "A" terminal. If the voltage is still low there, TEMPORARILY "full field" the generator by jumpering the "F" terminal on the generator to ground. If this brings the voltage up, suspect the regulator, and check the wiring between the generator and regulator. If "full fielding" the generator does not make it charge above 13.5 volts, you have generator problems.

Engine electrical and ignition systems make a lot of electrical noise, which can screw up cheap digital meters, and cause inaccurate readings. I usually use an analog meter around this equipment, or a quality digital meter.

Follow Ups:

• Re: Re: Checking a generator Doug in OR 10:13:29 06/20/04 (0)

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