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JD 720 voltage regulater

A

Anonymous-0

Well-known Member
I've got a 6 volt system on my 720 diesel, the regulator charges a few amps to recharge the battery after starting like it should but if i turn the lights on it doesn't charge enough to keep up with the lights, it'll show discharge on the amp gauge. When i ground the generator directly it'll charge plenty to keep up with the lights but don't want to do that all the time though. Is their anyway to adjust the regulator to keep up with the lights but yet when the lights are turned off to resume back to "normal" charging ?
 
During normal operation, without the lights on, what is the battery voltage? About 7.4 Volts would be normal.
 
Its indeed possible to tweak most VR's to increase charge rate butttttttt I just dont get into describing it over the net as it can involve spring tensions and air gaps and I dont have the specs. I've cleaned/buffed/polished the internal VR relay contacts which may help and no other adjustemnts utilized. It could be minor things such as poor grounds (BOTH genny and VR need good grounds) or bad connections. That being said, if it charges plenty with the FLD post direct shorted to ground that tells me the genny is fine so its EITHER a VR problem or else, again, a bad VR ground.
Make sure the belt is good and its tight and Id insure all good wiring connections ESPECIALLY the VR's ground, try a jumper wire direct to the grounded battery post to the VR for a ground n see what happens.

John T
 
On some of the old JDs they grounded the generator with the light switch when you turned the lights on. I don"t remember which models.
 
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