The Ford Barn

Harold Degand · 04-14-2026, 01:11 PM

Hi.

My French flathead is originally equipped with a 5 1/8 in 24volt gen.

I want to fit a more common 12v gen.

What is the diameter of an 8BA generator ?

47topless · 04-14-2026, 01:38 PM

24v ?

petehoovie · 04-14-2026, 01:42 PM

Quote:

Originally Posted by Harold Degand

Hi.

My French flathead is originally equipped with a 5 1/8 in 24volt gen.

I want to fit a more common 12v gen.

What is the diameter of an 8BA generator ?

ndnchf · 04-14-2026, 02:08 PM

Stock 8ba generator is 4.850" diameter.

Harold Degand · 04-14-2026, 02:18 PM

Quote:

Originally Posted by 47topless

24v ?

Yes, those engines come from military trucks

cas3 · 04-14-2026, 04:50 PM

Sponsored Links (Register now to hide all advertisements)

In WW2 jeeps were 6v, some trucks were 12v, and big stuff was 24 volt. So, after that they got smart and made everything 24 volt , so a jeep could jump a tank, all bulbs are the same, and even dashboards interchange.

04-14-2026, 01:38 PM	#2
47topless Senior Member Join Date: Jun 2022 Location: Northern Colorado Posts: 496	Re: 8BA gen size 24v ?

04-14-2026, 02:08 PM	#4
ndnchf Senior Member Join Date: May 2012 Location: Fredericksburg, Virginia Posts: 1,205	Re: 8BA gen size Stock 8ba generator is 4.850" diameter. __________________ Restored Ford 6 & 12 volt generators Last edited by ndnchf; 04-14-2026 at 02:29 PM.

04-14-2026, 04:50 PM	#6
cas3 Senior Member Join Date: Jan 2011 Location: Beverly Kansas Posts: 5,557	Re: 8BA gen size Sponsored Links (Register now to hide all advertisements) In WW2 jeeps were 6v, some trucks were 12v, and big stuff was 24 volt. So, after that they got smart and made everything 24 volt , so a jeep could jump a tank, all bulbs are the same, and even dashboards interchange.