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Tracy Martin TN 
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Joined: 11 Sep 2009
Location: Gallatin,TN
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 Topic: D15 charging system
Posted: 27 May 2010 at 9:45pm |
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I think my voltage regulator is sticking or bad. If I replace the regulator how do you install it properly. How is it polarized? Thanks Tracy Martin
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DonDittmar
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Joined: 15 Sep 2009
Location: MIllersburg, MI
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Posted: 28 May 2010 at 8:26am |
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Tracy, take a jumper wire and touch the gen terminal to the bat terminal.
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Experience is a fancy name for past mistakes. "Great moments are born from great opportunity"
1968 D15D,1962 D19D
Also 1965 Cub Loboy and 1958 JD 720 Diesel Pony Start
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DonDittmar
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Posted: 28 May 2010 at 8:48am |
I have the "How to Restore Tractor Magnetos" book, and in there it has a section on the old DC gens and VRs and how they work.
I see this question on here alot and I have to tell you guys there are 2 types of gens, an A circuit and a B circuit. Most Delco's, which is what we are used to seeing are A circuit and most lucas(8n fords) are B circuit. This has NOTHING to do with pos or neg ground, it has to do with how the gen works. In an A circuit the VR controls the GROUND for the field. In a B circuit the VR controls the POWER for the field. In what I told Tracy above only holds true for an A circuit gen. If it was a B circuit you would jump the BAT terminal to the Field terminal. DO NOT touch the F terminal on the VR to battery power on an A circuit. If you do the VR will be junk as the F terminal is hooked to very very fine wire and if you put + to it it will burn the wire off. There is no way to tell if you have an A circuit or B circuit for sure, without terinag the gen apart and looking at how the ground brush is wired. The ground brush will hook to the F terminal on the gen if its an A circuit.
So Tracy to make a long story longer, and assuming you have an A circuit gen,
F terminal on VR To F terminal on gen
Gen terminal on generator to gen terminal on VR
Battery terminal on VR to ammmeter, the out of the ammeter to battery positive
If you have an L (which is load) on your VR, that would go to the Ign switch BAT terminal.
To polarize jump the gen and bat terminal on the VR
Now, anyone wanna explain third brush gens???
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Experience is a fancy name for past mistakes. "Great moments are born from great opportunity"
1968 D15D,1962 D19D
Also 1965 Cub Loboy and 1958 JD 720 Diesel Pony Start
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DonDittmar
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Joined: 15 Sep 2009
Location: MIllersburg, MI
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Posted: 28 May 2010 at 8:51am |
To add to the above, sometimes the GEN terminal is also labeld ARM(for armature) Dont let this throw you off, they are the same thing.
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Experience is a fancy name for past mistakes. "Great moments are born from great opportunity"
1968 D15D,1962 D19D
Also 1965 Cub Loboy and 1958 JD 720 Diesel Pony Start
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Butch(OH)
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Joined: 11 Sep 2009
Location: Lucerne Ohio
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Posted: 28 May 2010 at 8:56am |
Regulators do not need to be polarized, you do need to make sure you obtain one that is correct for your ground, + or -. Installation is straight forward, make sure it is grounded and wired up correctly. They are reasonably tough but easier to fry than the old cut out relay. Make sure ou have the polarity correct, dont jumper or ground anything unless you know what you are doing. It used to be you could pretty much bet that a new regulator would be set correctly, no more, at least the last three I bought were not. There is quite a bit more to properly setting a regulator than I care to type here. I suggest the night before you install it You punch it in a search engine and read for a few hours, its cheaper than replacing batteries. I have had no luck with the regulators sold at places like TSC and Farm Fleet. Go to NAPA or an auto electric rebuild shop, brace yourself and pay the frieght.
Edited by Butch(OH) - 28 May 2010 at 8:58am
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Butch(OH)
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Posted: 28 May 2010 at 9:10am |
 DonDittmar wrote:
I have the "How to Restore Tractor Magnetos" book, and in there it has a section on the old DC gens and VRs and how they work.
I see this question on here alot and I have to tell you guys there are 2 types of gens, an A circuit and a B circuit. Most Delco's, which is what we are used to seeing are A circuit and most lucas(8n fords) are B circuit. This has NOTHING to do with pos or neg ground, it has to do with how the gen works. In an A circuit the VR controls the GROUND for the field. In a B circuit the VR controls the POWER for the field. In what I told Tracy above only holds true for an A circuit gen. If it was a B circuit you would jump the BAT terminal to the Field terminal. DO NOT touch the F terminal on the VR to battery power on an A circuit. If you do the VR will be junk as the F terminal is hooked to very very fine wire and if you put + to it it will burn the wire off. There is no way to tell if you have an A circuit or B circuit for sure, without terinag the gen apart and looking at how the ground brush is wired. The ground brush will hook to the F terminal on the gen if its an A circuit.
So Tracy to make a long story longer, and assuming you have an A circuit gen,
F terminal on VR To F terminal on gen
Gen terminal on generator to gen terminal on VR
Battery terminal on VR to ammmeter, the out of the ammeter to battery positive
If you have an L (which is load) on your VR, that would go to the Ign switch BAT terminal.
To polarize jump the gen and bat terminal on the VR
Now, anyone wanna explain third brush gens??? |
Unless a person runs into something VERY oddball like made for the military, NASA, the USSR or Mars ALLl tractor or automotive generators made by Delco will be "A" type and all Autolite or Ford will be "B" type. If somebody threw a Lucas on it throw it away before it burns your tractor to the ground, LOL
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DonDittmar
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Posted: 28 May 2010 at 11:40am |
Agreed on the oddball stuff butch, but I had to throw it out there because about the time I dont is when someone runs into it. I have ran into a lucas on a fordson major diesel and an 8N. Had I read that book and learned about A and B circuit gens, I would have been lost.
Good advice on the regualtor having to be grounded. Being an A circuit is controlled be the ground side, if the regulator frame is not grounded, she wont work.
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Experience is a fancy name for past mistakes. "Great moments are born from great opportunity"
1968 D15D,1962 D19D
Also 1965 Cub Loboy and 1958 JD 720 Diesel Pony Start
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Tracy Martin TN
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Joined: 11 Sep 2009
Location: Gallatin,TN
Points: 10662
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Posted: 28 May 2010 at 2:03pm |
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Thanks for the help guys. I will try it out this weekend. Thanks Again, Tracy
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