Old voltage regulators

Hi folks.

I've been having trouble with a 12v voltage regulator and generator on my old international. I've ordered a new VR for it and am waiting for it to come in. I don't think I fully understand how they work and I'm a little hard headed so I've been doing all the testing I can find on it and all the procedures say basically if this ( whatever test result) is the case then replace the VR with a new one. But it doesn't say what it is that is wrong. . If there a short in the windings somewhere? is a contact too to worn? Did all the magic leak out? . . Nothing. On everything else I know what it is that failed and why it needs replaced.

Anyway a buddy gifted me with box of old regulators. All of them were obviously bad except for 2. Just dirty contacts, the problem is how can I tell what voltage and amp range they are for? There are no markings on them. One is a 3 bobbin type the other a 2 bobbin. The 2 bobbin one has 4 connections but one is a dummy (so really only 3) and it has very light (thin wire) windings. I'm guessing this is a 6v one. The other 3 bobbin has thicker wire windings and I'm guessing this is for 12v it also has 3 connections.

I would guess that the one with the heavy winding is a 6 volt. Take them to a shop that does generator work & have them run on a test bench. If I had them here I could test them myself.

Did you order the one that made for the # on your gen remember the reg doesent charge the gen does mite need to have the gen checked out first. Is the system pos or neg ground that is also important. The gen can be either but the reg sure neds to be the same polarity as the system is wired for

I think you are right Teddy, It seems the lower the voltage, the larger the wire.

(quoted from post at 13:32:04 12/29/15) Did you order the one that made for the # on your gen remember the reg doesent charge the gen does mite need to have the gen checked out first. Is the system pos or neg ground that is also important. The gen can be either but the reg sure neds to be the same polarity as the system is wired for

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Hi Thanks

The gens new and puts out 25v when it's hooked up to the regulator. the GEN light is on and the voltage hunts continuously and goes higher (too high) at high RPM's Yes I can get the regulator tested and might do that. I wonder if when I ask what happened to it if I'll get ore than a shrug ?

The regulator in the tractor has heavier wire all around so I maybe incorrectly assumed that the thin wire was for the lower voltage I suppose it could be for low voltage and high amperage.

Does your old regulator have numbers on it? What model IH are you working on? Most tractors used a 2 unit regulator, one being the cut-out relay, the other unit being a combination current voltage regulator. Do you have a voltmeter and a separate amp meter you can install in the circuit. Are you a reader if you get some information on regulators? Need an e-mail address or a phone number from you. J.

(quoted from post at 22:23:28 12/29/15) Does your old regulator have numbers on it? What model IH are you working on? Most tractors used a 2 unit regulator, one being the cut-out relay, the other unit being a combination current voltage regulator. Do you have a voltmeter and a separate amp meter you can install in the circuit. Are you a reader if you get some information on regulators? Need an e-mail address or a phone number from you. J.

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The generator is a lucas C40. The original Vreg Is a Lucas RB108. The only replacement is the Lucas RB340 knock offs that I gather aren't made very well. I see now after being to the rebuild er that the settings are very touchy. He had one on the shelf and my old one and an original Lucas only the original lucas worked. One wouldn't work with the cover on. I suspect the iregilar shaped gasket is deforming the base of these when you tighten the lid on.

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