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Farmall & IHC Tractors Discussion Forum

Voltage Regulator

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01-13-2018 11:39:34

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Installed my rebuilt generator and new voltage regulator on a 1955 Farmall 100. Charging gauge showed positive charge then 0 after a few minutes. Took the generator back to the shop and it tested good. Gentleman told me those after market regulators are no good. I examined the insides and see nothing obvious. The old regulator is a USA brand, badly rusted on the exterior but insides look good except one of the contact points isn't making good contact...skews to one side but I think I can adjust it. Thoughts and comments welcome on after market regulators and source for OEM if it comes to that.

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01-20-2018 16:48:14

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 Re: Voltage Regulator in reply to Johnnykick, 01-13-2018 11:39:34  
I took my old regulator and soaked the base in Metal Rescue to remove the rust and it did a fantastic job. On examination of the points, the regulator relay points (near the F terminal) are barely touching, so I adjusted the post but still only get about 10% contact. Is that something to worry about?

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01-15-2018 09:51:51

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 Re: Voltage Regulator in reply to Johnnykick, 01-13-2018 11:39:34  
I now recall before Christmas disconnecting one of the battery terminals while running and the engine died. Back in the day, we would do that on autos as a test...but don't know if it works on a 6V positive ground generator.

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01-15-2018 11:16:13

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 Re: Voltage Regulator in reply to Johnnykick, 01-15-2018 09:51:51  
Don't do that. it allows the system voltage to go very high (never with an alternator) use a volt meter to assess charging, or the amp meter. Jim

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01-13-2018 13:50:06

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 Re: Voltage Regulator in reply to Johnnykick, 01-13-2018 11:39:34  
I've been getting USA made voltage regulators from Brillman - and they've worked good for me. Here is the regulator for a 100: https://brillman.com/product/6-volt-delco-type-voltage-regulator-premium/

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01-13-2018 13:14:59

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 Re: Voltage Regulator in reply to Johnnykick, 01-13-2018 11:39:34  
This 100 doesn't have lights, but based on what you said, I think I'm chasing my tail. This occured before Christmas and I did put a meter on the battery was getting greater than 6.5 volts...very close to 7 or maybe even 7.1 if my memory is correct. I put the meter on the generator terminals and got 6.5. I read somewhere that if I get 6.5 at the generator then it's not working. So I measured the terminals without any wiring and got a fraction. I later learned my method for measuring at the terminals was incorrect. I'll put it all back together and give it another try. Won't be anytime soon...it's 10 degrees here. Thanks for the help.

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01-13-2018 12:29:45

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 Re: Voltage Regulator in reply to Johnnykick, 01-13-2018 11:39:34  
John below is correct. if the battery is charged it takes only a few minutes to replace starting loss. Corectly operating it should show near nothing. If the lights are on and it discharges at 1/2 throttle it does have issues. If you measure the voltage at the battery it should be about 7 volts (again at 1/2 to 3/4 throttle. If at around 6.3 or less there is a problem. Jim

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john *.?-!.* cub owner

01-13-2018 12:11:25

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 Re: Voltage Regulator in reply to Johnnykick, 01-13-2018 11:39:34  
If the battery was charged up the 0 reading would be normal. Turn the lights on and see what happens.

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Bob M

01-13-2018 11:56:52

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 Re: Voltage Regulator in reply to Johnnykick, 01-13-2018 11:39:34  
I've had poor luck with imported regulators for my Super H and Minne-Mo U purchased at TISCO, etc. They work for a few months, then become either erratic or fail entirely.

After replacing with "made in USA" regulators from Agriservices (link below) I've had no problems. Price is nearly 3x an imported VR. But the savings are not worth the aggravation!

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