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Farmall & IHC Tractors Discussion Forum
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voltage regulator problem

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Charlie M

08-14-2006 16:18:21




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I have a 12 volt, negative ground genertor system on my 300U. The other day I noticed it wasn't charging. I reached down and tapped on the voltage regulator and it started working fine. I've had to do that the last few times I started the tractor. Is there something in there I need to clean or lubricate?




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John T

08-14-2006 20:01:02




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 Re: voltage regulator problem in reply to Charlie M, 08-14-2006 16:18:21  
Charlie, it sounds like the VR may have a loose connection or a poor ground or else one of its relay contacts is burned or carboned up or sticking.

The first thing I would do is remove n clean n wire brush and reattach each of its connections,,,,, next check n clean the VR's frame ground connection to the gennys case (if thats where it mounts),,,,, ,,if that dont cure it you might try n remove the cover and NON ABRASIVELY clean/buff/polish lightly the relay contacts in case they are burned or carboned over. You gotta be careful in abrasivley filing or grinding off too much of the silvery coating on any relay contacts cuz then they may go bad.

If shes not charging when running but does if you temporarily dead ground the gennys field post to the case, then I suspect either a bad field current control relay/contacts in the VR or else the VR isnt well grounded to the genny or else the wires bad from FLD on the VR to the gennys Field post.

If she charges ONLY if you momentarily jump the VR's BAT terminal over to its ARM/GEN terminal, then I suspect the VR's Cutout Relay/Contacts are bad.

If either dead grounding the gennys Field post or jumping the VR's BAT and ARM/GEN makes her charge, that tells me the genny is okay and its more likely a bad ground (VR to genny) or a bad VR (relay) or a wiring or connection problem

Try this n post back your findings and any questions, best wishes n God Bless

John T

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the tractor vet

08-14-2006 18:05:00




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 Re: voltage regulator problem in reply to Charlie M, 08-14-2006 16:18:21  
Go steal one of the wifes emery boards that she uses to fiel her nails with the fiber kind .



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Joe Kimbriel

08-14-2006 16:57:55




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 Re: voltage regulator problem in reply to Charlie M, 08-14-2006 16:18:21  
You may have to burnish the relay contacts as they might be sticking or not making contact. Don't grind on them too much or you will be sending the regulator off for re-calabration.



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