Ford Model T +++ or ---- Ground ???

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Michael Davis
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Ford Model T +++ or ---- Ground ???

Post by Michael Davis » Fri Nov 01, 2019 7:11 pm

Thanks Mike
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RajoRacer
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Re: Ford Model T +++ or ---- Ground ???

Post by RajoRacer » Fri Nov 01, 2019 7:13 pm

Originally negative ground.

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Re: Ford Model T +++ or ---- Ground ???

Post by RajoRacer » Fri Nov 01, 2019 7:14 pm

Nice looking Runabout too !


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Re: Ford Model T +++ or ---- Ground ???

Post by Moxie26 » Fri Nov 01, 2019 8:08 pm

Positively... Negative ground.

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Re: Ford Model T +++ or ---- Ground ???

Post by TonyB » Fri Nov 01, 2019 10:26 pm

———
Tony Bowker
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Steve Jelf
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Re: Ford Model T +++ or ---- Ground ???

Post by Steve Jelf » Fri Nov 01, 2019 10:36 pm

March 1922 to 1927  Wiring Diagram.jpg
The inevitable often happens.
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Matt in California
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Re: Ford Model T +++ or ---- Ground ???

Post by Matt in California » Sat Nov 02, 2019 12:00 am

A while back I did some research and found the following:
Why a Positive ground?

For early cars with varnished cloth wires would absorb moisture and cause corrosion. It was found that reversing the polarity would actually reduce corrosion.

Why a Negative ground?

After plastic coating of wires was common and the transistor was desired. Electronics industry standardized NPN (Negative-Positive-Negative) transistors.

So Ford Ts were based on the original thought that electrons flow from positive to negative and we should turn off the positive. In reality the electrons flow from negative to positive an evidently that can cause a issue to leave the charge across the ground creating corrosion so Model A went to positive ground. Does anyone know when for switched back?

Enjoy,
Matt


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Michael Davis
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Re: Ford Model T +++ or ---- Ground ???

Post by Michael Davis » Sat Nov 02, 2019 8:50 am

Thanks


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Re: Ford Model T +++ or ---- Ground ???

Post by Moxie26 » Sat Nov 02, 2019 11:00 am

Ford returned to using the negative ground system in 1956 and also 12 volt batteries

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Re: Ford Model T +++ or ---- Ground ???

Post by Mark Gregush » Sat Nov 02, 2019 12:43 pm

Unless you are running a diode or modern voltage regulator, the T does not care what ground you are using as long as the meter is hooked up right. The old books said to reverse the leads every so often on non generator cars to even the points wear if running them on battery. Mechanical cutouts don't care what ground is used as long the generator is polarized to that ground.
I know the voices aren't real but damn they have some good ideas! :roll:

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Re: Ford Model T +++ or ---- Ground ???

Post by Scott_Conger » Sat Nov 02, 2019 6:17 pm

Michael

that is a very nice looking car
Scott Conger

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