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Which voltage regulator?

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Pete Misiaszek

03-19-2001 10:00:40




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I must replace the voltage regulator on my 8N, but I'm not sure which one to use. The guy I bought it from told me it was a "mix" of years. There are three heavily painted machined areas in a row on the block, the largest has the only numbers I can read, and they are 42128. The generator is a rebuilt replacement, and all I can find on it is 8031. That serial number would correspond with a pre-1950 8N. Both the pre-1950 and later regulator look exactly the same to me. Is there any way I can be sure which one I need, and if I install the wrong one, will I do the system any harm?

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Claus

03-19-2001 10:24:26




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 Re: Which voltage regulator? in reply to Pete Misiaszek, 03-19-2001 10:00:40  
The Generator 8N-10000-B is a 20 amp unit (140 Watts) and utilizes regulator 8N-10505-B. The Generator 8N-10000 and 8N-10000-A is a 11.5 amp (75 watts) unit and utilizes regulator 8N-10505-A. I do not know exactly when the switch was made. The diffences in the regulators are in the current coils that limit the current. Obviously, if you use the 20 amp unit on the 11.5 amp generator it would be possible to overheat the field winding of the generator at sustained running at high amperage. There is a differences of .6 ohms in the field winding resistance in the late and early generators. This is beyond the capability of most 2 wire ohm meters to measure accurately.
Happy Motoring
Claus

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Dell (WA)

03-19-2001 12:40:25




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 Re: Re: Which voltage regulator? in reply to Claus, 03-19-2001 10:24:26  
The 8N frontmount 6 volt electrical system used the 11.5 amp generator and 8N-10505A regulator.

The 8N sidemount 6 volt electrical system used the 20 amp generator and 8N-10505B regulator which has been superceded by 8N-10505C regulator.

HTH..... .Dell



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Pete Misiaszek

03-19-2001 18:37:16




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 Re: Re: Re: Which voltage regulator? in reply to Dell (WA), 03-19-2001 12:40:25  
Claus, Dell, thanks for the info. Dell, could you be a bit more specific about the difference in location of the front and side mount generator? As you face the front of the tractor, my generator is located on the left side, at the front. Do I have a front or side mount?



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Phil (AZ)

03-22-2001 10:45:10




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 Re: Re: Re: Re: Which voltage regulator? in reply to Pete Misiaszek, 03-19-2001 18:37:16  
Pete,
Your Post:"As you face the front of the tractor, my generator is located on the left side"

The sides of a tractor are determined by sitting in the seat looking forward. You have a gen on "tractor's" right side.

Hope this Helps



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Dell (WA)

03-19-2001 20:41:08




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 Re: Re: Re: Re: Which voltage regulator? in reply to Pete Misiaszek, 03-19-2001 18:37:16  
Pete..... ..the frontmount distributor N-Engine have their generator on the right side of the tractor, which is the same side as the carburator is.

The later 1950 8N sidemount distributor is on the right side of the engine and in the way of the earlier generator, therefore Ford mounted the generator on the left side of the engine.

Therefore, since you claim that your generator is on the left side, you have a sidemount 8N engine and 20 amp generator. HTH..... ...Dell

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Peter Misiaszek

03-20-2001 04:58:21




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 Re: Re: Re: Re: Re: Which voltage regulator? in reply to Dell (WA), 03-19-2001 20:41:08  
Dell, Is there some way I can test the gnerator amperage to be sure which I have. The 8N I have had a complete, "new" electrical system installed when I bought it... harness, re-built generator, distributer, etc. But, it was a backyard project by the guy I bought it from, and my bet is that he used parts from several tractors. When I called him, he told me that I had "the older" generator, but I definitely have a side-mount distributor. Based on what he told me, I bought the earlier 11.5 amp regulator. If I guessed wrong, what will happen if I use a 11.5 amp regulator with a 20 amp generator?

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Dell (WA)

03-20-2001 08:12:19




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 Re: Re: Re: Re: Re: Re: Which voltage regulator? in reply to Peter Misiaszek, 03-20-2001 04:58:21  
Pete..... .there is no shadetree mechanic test that I know about to pull 20 amps out of a generator. Good old fashioned real generator rebuilders have a special testbench and carbon load.

Side by side, the 20 amp 8N gen is about 1" diameter bigger than the 11.5 amp 8N generator but I can't remember exactly but seem to 'member about 6" for 20 amper and 4 1/2 for 11.5 amp gen.

I don't know for certain, but if'n you correctly install the 11.5 amp reg and polarize it, I think the end result would be that you only generate 11.5 amps with your 20 amp generator before the regulator regulates. 11.5 amps is enuff for most N's as long as you are not runnin' nites and headlights (which take about 5 amps each)

Unfortunately, most automotive electrical parts sales are "no return". Its your dollar, but I'd still try to exchange it anyways..... ..Dell

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Peter Misiaszek

03-20-2001 11:51:45




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 Re: Re: Re: Re: Re: Re: Re: Which voltage regulator? in reply to Dell (WA), 03-20-2001 08:12:19  
Dell, Thanks for all your help. There's no way I'll know which generator is hanging on my 8N, so I think I'll use the regulator. I think you're correct, with a 20 amp generator, and a 11.5 amp regulator, I should just get a reduced charge. I don't ever use the lights, so I don't think I should have a problem. As you explained it, the opposite combination could be a problem... a 20 amp regulator pulling on a 11.5 amp generator. So, since I don't know for sure which generator I have, it is probably better that I don't exchange for the 20 amp regulator. I have a 50-50 chance of having the right regulator, and if I don't, I don't fry my generator. I sure appreciate your assistance.

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