The Ford Barn

Piet · 04-17-2025, 05:14 AM

just a double check. The cutout below is not polarity sensitive right? my ford is neg ground.

The cutout with diode is polarity sensitive, I know that. But the mechanical one I started to doubt now. But I don't think so.

fourfords · 04-17-2025, 05:32 AM

This looks like a reproduction cutout. In the photo on the left, The contact on the left goes to the battery. The contact on the right in the same photo goes to the generator.

nkaminar · 04-17-2025, 06:02 AM

There are two coils: one with small wire and many turns and one with larger wire and fewer turns. The one with small wire is voltage sensitive and closes the contacts once the generator voltage is high enough. The one with fewer turns has the full current running through it once the contacts close and keeps the contacts closed. Neither coil is polarity sensitive.

Piet · 04-22-2025, 09:43 AM

thanks. There are cut outs that are polarity sensitive right?

J Franklin · 04-22-2025, 12:04 PM

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Quote:

Originally Posted by Piet

thanks. There are cut outs that are polarity sensitive right?

Ones that use a diode. You can use one for a Model T on -ground.

04-17-2025, 05:32 AM	#2
fourfords Senior Member Join Date: May 2010 Location: Lake Elsinore, CA. Posts: 476	Re: model a cutat polarity sensitiv This looks like a reproduction cutout. In the photo on the left, The contact on the left goes to the battery. The contact on the right in the same photo goes to the generator.

04-17-2025, 06:02 AM	#3
nkaminar Senior Member Join Date: Jan 2012 Location: Western North Carolina Posts: 5,875	Re: model a cutat polarity sensitiv There are two coils: one with small wire and many turns and one with larger wire and fewer turns. The one with small wire is voltage sensitive and closes the contacts once the generator voltage is high enough. The one with fewer turns has the full current running through it once the contacts close and keeps the contacts closed. Neither coil is polarity sensitive. __________________ A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past.

04-22-2025, 09:43 AM	#4
Piet Member Join Date: Apr 2019 Posts: 48	Re: model a cutat polarity sensitiv thanks. There are cut outs that are polarity sensitive right?