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05-21-2021, 03:21 PM | #1 |
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Location: Farmington, MN
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6V Pos. ground Flathead V8 generator wiring
Hey everyone! I have a '41 Flathead in my '28 roadster pickup and am working on wiring the engine. I was told to get a voltage regulator for wiring, so I did. I was able to have my generator rebuilt locally and they verified the cut out on it was in good working order. I have been told I should not run both the cut out and the voltage regulator as they are one in the same. Is this true, and does anyone have a diagram for wiring a 6v +ground generator off of a cut out? I'm trying to get the truck driving so my family and I can enjoy it for the summer.
Thanks in advance!
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05-21-2021, 03:35 PM | #2 |
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Re: 6V Pos. ground Flathead V8 generator wiring
Do not need the voltage regulator if your Gen has the cut out on top.
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05-21-2021, 03:47 PM | #3 |
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Re: 6V Pos. ground Flathead V8 generator wiring
Thank you Ken. I appreciate the insight!
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05-21-2021, 05:48 PM | #4 |
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Re: 6V Pos. ground Flathead V8 generator wiring
In my opinion, it is the other way around. If you have a voltage regulator, don't run the cut-out. By 1941, all fords had voltage regulators, which are superior to cut-outs. Unless you have an odd mix of old and new stuff, forget the cut-out.
I think we need a little more information on what you actually have. |
05-21-2021, 06:48 PM | #5 |
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Re: 6V Pos. ground Flathead V8 generator wiring
You need to establish what year type of generator you have. Is it a two brush generator which would require a 3 unit voltage regulator, or is it a 3 brush generator which requires the round ford cut out on top of it ? Regards, Kevin.
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05-22-2021, 06:33 AM | #6 |
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Re: 6V Pos. ground Flathead V8 generator wiring
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The voltage regulator has a cutout built into it so a second cutout is not necessary. Last edited by Terry,OH; 05-22-2021 at 06:52 AM. |
05-22-2021, 07:12 AM | #7 |
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Location: Farmington, MN
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Re: 6V Pos. ground Flathead V8 generator wiring
Thanks for all the helpful info everyone. I guess I should have posted a picture of the generator I'm running. I'm assuming it's a '41 as that is what year we found the block to be and it was fully assembled when I got the engine/trans.
It's hard to see, but the best picture I could find this morning.
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05-22-2021, 07:59 AM | #8 |
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Re: 6V Pos. ground Flathead V8 generator wiring
Appears to be much earlier than 41. Looks like a three brush unit that will not need the regulator. The output side of the cutout should go through your ammeter gauge and to the battery -
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05-22-2021, 08:47 AM | #9 |
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Re: 6V Pos. ground Flathead V8 generator wiring
Thank you Terry! That helps a lot!
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03-26-2022, 06:45 PM | #10 |
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Location: Milaca, MN
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Re: 6V Pos. ground Flathead V8 generator wiring
IF... your generator is a 3 brush unit, came with and has a cutout on top, that is a pre-1939 generator and does not use an external mounted regulator. The output connection on the cutout goes to the ammeter, from there to the battery minus post, not the positive. All old Fords were positive ground.
Google the wiring diagram for the '35 Ford, it's simple wiring as to the charging system. |
03-26-2022, 06:48 PM | #11 |
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Location: Milaca, MN
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Re: 6V Pos. ground Flathead V8 generator wiring
Yep, you have to know which generator you have, it's either a 3 brush or it's a two brush, those have the output terminal on the rear end-plate, the field and ground are on the top.
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