Re: Farmall B alternator/ammeter

Posted by John T on August 01, 2007 at 05:50:53 from (66.244.83.147):

In Reply to: Farmall B alternator/ammeter posted by Dave H (MI) on July 31, 2007 at 19:21:54:

Dave, Plenty of old ammeters have a stuck needle n dont deflect in either direction. As posted below it ought to deflect to - discharge if the lights or ignition are turned on when shes NOT running then, of course, swing over to + charge at RPM if all is working. If you dont have a voltmeter to place on the battery (battery voltage should rise from 12.6 to the 13 n over 14 volt range if shes charging properly) the lights should brighten noticeably from slow idle to high RPM if shes charging.

Sure the ammeter is even wired in and wired correct??? The Supply side terminal (only one wire there usually) connects to the hot ungrounded battery post, often by a wire from the starter switch or solenoid where the big battery cable connects. Then alllllllll loads like lights n ignition PLUS the alternators output connect to the ammeters other Load side terminal.

If the battery is good (have it load tested) but it runs down n requires re charging, sounds like theres a charging or wiring problem. I dont have much in the way of alternator troubleshooting tips, Im more into generators, but Bob M or Jim or the other Bob may have some troubleshootign tips on them. I simply see if the lights glow brighter from slow idle to fast RPM (means shes charging) or use a voltmeter on the battery AFTER Im sure all is wired correct........

John T

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