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farmall cub bad voltage regulator?

glennster

glennster

Well-known Member
went to mow with the 49 cub. started the tractor and let it idle, amp gauge showed about 5 amp charge. as soon as i increased the throttle, amp gauge swung to about 10 amp discharge, turned the lights on and got a 15 amp discharge. shut it off, polarized the genny and restarted. charging at idle but as soon as rpm increase-goes to discharge. grounding the field gives about 15 amp charge. bad voltage regulator? the v-reg is about 4 years old, came from i-h.
 
Kind of sounds like it is the problem. Do you recall where your IH regulator was made? I see Brillman's offer a USA made regulator.
 
If it charges good all the time (should still increase with RPM) with a grounded Field, but it does but NOT when using the VR normally, the VR is bad or isn't well grounded or mis adjusted. Insure a good VR ground before you spend any bucks.

John T
 
i'll check the vr ground and make sure its good. kinda struck me as odd that it discharged that much. about 10 amps . with the tractor off and the lights on , it normally shows about a 5 amp draw.
 
VRs are a racket. They cost a bundle and I haven't bought a good one in years. I spent lotsa bucks rebuilding a generator and then going through several regulators before I finally got a cheap alternator. I have one more thing on the farm with a generator and regulator. When that goes I'm not even trying to find one. It's the original from 1958 so it will likely outlast me, anyway.
 
When you get a new one make sure you have the # of the gen so they can match the correct reg for that gen Car Quest has USA regs
 
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