12V wiring question

Brad Gyde · Mar 10, 2011

Hey guys,

I asked this question in Farmall board, and I'm not really getting the answer I am looking for.. so I'm gonna ask here.

I'm converting my Farmall cub over to 12V. It will still be generator, NOT an alternator. I'm not sure if it had a cut-out on it before or not, I believe it should have been a voltage regulator.. All i can do is ask the rebuilder when I pick it up if it was a cut-out or a V-reg.

The way it was wired when I pulled it seems to be the 2 posts of the generator were connected to the V.reg/cutout and the 3rd wire appears to run back to the "switch box"

Will I have to do any wiring change? If I do, can someone help tell me what I'd have to do?

I already understand I have to change the regulator (which will be done by the rebuilder) and that swapping to negative ground would be better, and that I have to change light bulbs. Mag ignition, so no change of polarity on the coil, will have to change polarity on ammeter though.

Thanks in advance,
Brad

buickanddeere · Mar 10, 2011

Delco generator with a 3 or 4 wire regulator?
F on generatoer to F on the regulator.
A on generator to A on regulator.
There will be regulator terminal(s) for either or a B for battery or L for light. Run that to one side of the ammeter along with the wire(s) for the ignition and light switch. The other side of the ammeter should be conencted only to the battery.
I would highly recommend a fuse between the ammeter and it's connection to the battery. Reduces the chances of electrical fires.
You can pull the fuse to keep somebody from running the battery down or joy ridding your tractor.

Brad Gyde · Mar 10, 2011

I believe he will be installing a 3 wire regulator, but not 100% sure on it.

So I want to hook the genny B(or L) "lead" to the negative side along with the lights then? (no ignition switch) and battery to the positive side (as i am going to switch to negative ground)?

Sorry to ask what feel to be silly questions.. I just don't want to "let the smoke out" of anything..

Thanks,

Brad

rustyfarmall · Mar 10, 2011

(quoted from post at 07:28:39 03/10/11) I believe he will be installing a 3 wire regulator, but not 100% sure on it.

So I want to hook the genny B(or L) "lead" to the negative side along with the lights then? (no ignition switch) and battery to the positive side (as i am going to switch to negative ground)?

Sorry to ask what feel to be silly questions.. I just don't want to "let the smoke out" of anything..

Thanks,

Brad

Brad, I just now did give you an answer on the Farmall board, but to clarify even more, BobM has provided some most excellent wiring diagrams.

http://s101.photobucket.com/albums/m46/farmallbob/Farmall Tractor Wiring Diagrams/

There are several diagrams there to choose from, so you need to sort through and find the one that fits your application.

Brad Gyde · Mar 10, 2011

Thanks..

I just saw the post on the Farmall board and responded to it too, but I think with some diagrams, and what you and B&D have told me, I bet I can nearly figure it all out..

If it don't work, I'll be askin questions again.. should have the genny back tomorrow.. YAY!!

Brad

John T · Mar 10, 2011

If youre converting to 12 volts Id use Negative Ground,,,,,,

I would use a 3 wire (BAT ARM FLD) full fledged 12 volt Voltage Regulator versus messing with a Cutout Relay and any LHBD ligth switch charge regulation. Make sure the VR is suitable for NEG ground,,,,,,

BAT on VR to load (NOT battery/starter) side of ammeter......ARM/GEN on VR to ARM post on Genny,,,,,FLD on VR to gennys FLD post,,,,,loads like lights/ignition switch get hot battery voltage supply from LOAD side of ammeter, same terminal that wires to BAT on VR. Other Supply side of ammeter gets hot battery voltage often where big battery cable wirres to starter switch.

If it was Pos ground before, ammeter leads need reversed or it will read bass ackwards.

Polarize the genny BEFORE start up

LOOK AT BOB M'S WIRING DIAGRAMS

If this isnt the answer youre looking for I dont know what to tell you

John T

Brad Gyde · Mar 10, 2011

Thanks John,

Yep, I think I finally got the answers I was lookin for..

I'd sure hate to get everything hooked up and end up with more trouble, that's why I'm asking for the step by step more or less.. and the diagrams in my owner's manual still left me with some questions, so, the wealth of knowledge here was next stop.

My main concern was if there would be wiring differences if it had a cutout before and I know I'll have a regular VR when I get it back (because the rebuilder called about a hour ago and told me what will be done and the cost)

I mentioned I'm only 30 in another post, so by the time I began playin with dad's wrenches the generator, cutout, and VR had all about been obsolete. Alternator conversions, I can do them.. and after this, I'll be able to do this too. Dad never had much experience with genny's either, so when we get to this kinda thing it's like giving kryptonite to superman so to speak.. LOL.

Thanks again

Brad

rustyfarmall · Mar 10, 2011

(quoted from post at 07:59:12 03/10/11) Thanks John,

Yep, I think I finally got the answers I was lookin for..

I'd sure hate to get everything hooked up and end up with more trouble, that's why I'm asking for the step by step more or less.. and the diagrams in my owner's manual still left me with some questions, so, the wealth of knowledge here was next stop.

My main concern was if there would be wiring differences if it had a cutout before and I know I'll have a regular VR when I get it back (because the rebuilder called about a hour ago and told me what will be done and the cost)

I mentioned I'm only 30 in another post, so by the time I began playin with dad's wrenches the generator, cutout, and VR had all about been obsolete. Alternator conversions, I can do them.. and after this, I'll be able to do this too. Dad never had much experience with genny's either, so when we get to this kinda thing it's like giving kryptonite to superman so to speak.. LOL.

Thanks again

Brad

Brad, no need to apologize for your age. I'm 60, and the cutout relay thing was before MY time, so when I drug home a 1940 Farmall H that was still using that relay, I had to my homework to understand how to make it functional once again and then how to use it.

12V wiring question

Brad Gyde

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buickanddeere

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Brad Gyde

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rustyfarmall

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Brad Gyde

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John T

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Brad Gyde

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rustyfarmall

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