The Ford Barn

BILLF/TRF · 08-19-2011, 05:41 PM

I am installing a 6 volt alternator in my '31 tudor. It will have a negative ground. I have original wiring and i was wondering about how to hook up the "-" and "+" positive terminals of the coil. Does the black wire from the terminal box go to the "+" terminal on the coil and the red wire go to the "-" terminal or is it the opposite? Thanks.

Ray With · 08-19-2011, 06:06 PM

positive goes to + on the coil and - to neg.

BILLF/TRF · 08-19-2011, 07:15 PM

Quote:

Originally Posted by Ray With

positive goes to + on the coil and - to neg.

So I would have to switch the wires from their original configuration (with positive ground) of black to "-" and red to "+" to the opposite when switching to negative ground?

Tom Wesenberg · 08-20-2011, 03:48 AM

It's too bad all coils don't have a + and - on them. Since your's does, then it's eay to know how to connect it. Whatever battery terminal is grounded is the same polarity on the coil that goes to the points. Negative battery ground means - on coil goes to the points.

johnbuckley · 08-20-2011, 05:06 AM

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A couple of years ago I got a polarity tester ( A-12116) from Snyders. Great gadget as it saves my brain getting tied in knots and you can check everyone else's wiring at the club meet and find that approx 25% have their coil incorrectly wired!

08-19-2011, 05:41 PM	#1
BILLF/TRF Senior Member Join Date: May 2010 Location: Thief River Falls, MN Posts: 155	ignition coil question I am installing a 6 volt alternator in my '31 tudor. It will have a negative ground. I have original wiring and i was wondering about how to hook up the "-" and "+" positive terminals of the coil. Does the black wire from the terminal box go to the "+" terminal on the coil and the red wire go to the "-" terminal or is it the opposite? Thanks.

08-19-2011, 06:06 PM	#2
Ray With Senior Member Join Date: Jul 2011 Location: Montgomery,Texas Posts: 115	Re: ignition coil question positive goes to + on the coil and - to neg. __________________ Hotrodchat's Picture Gallery 26,000 pictures to keep you looking

08-20-2011, 03:48 AM	#4
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: ignition coil question It's too bad all coils don't have a + and - on them. Since your's does, then it's eay to know how to connect it. Whatever battery terminal is grounded is the same polarity on the coil that goes to the points. Negative battery ground means - on coil goes to the points.

08-20-2011, 05:06 AM	#5
johnbuckley Senior Member Join Date: Jul 2010 Location: United Kingdom Posts: 1,444	Re: ignition coil question Sponsored Links (Register now to hide all advertisements) A couple of years ago I got a polarity tester ( A-12116) from Snyders. Great gadget as it saves my brain getting tied in knots and you can check everyone else's wiring at the club meet and find that approx 25% have their coil incorrectly wired!