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Coil wiring 1950 3100
#1287576 Thu Nov 15 2018 10:00 PM
Joined: Jun 2016
Posts: 182
Jhyp Offline OP
Shop Shark
A little help please. Does the ignition switch wire connect to the positive or negative side of the coil? Tkx

Re: Coil wiring 1950 3100
Jhyp #1287587 Thu Nov 15 2018 11:15 PM
Joined: Jun 2012
Posts: 1,729
Shop Shark
+ to the switch. - to the points. The coil will work wired backwards, but, not as well. The windings in the coil are insulated from the can outside. So it will not short out. The coil is wound in a manner that reversing the current flow may reduce the output voltage(efficency) . That is an "Engineer" convesation that we can avoid. The last conversation I got stuck in like that was about "hole flow". Look it up if you need to. Still makes my headake after 50 years.

Steve H
Re: Coil wiring 1950 3100
Jhyp #1288032 Mon Nov 19 2018 03:41 AM
Joined: Jun 2008
Posts: 1,458
Shop Shark
That’s interesting Steve. I never knew it made a difference which side the ignition was wired to. I learned something today!

1950 Chevy 1/2 ton (original)
1951 Chevy 1/2 ton (future streetrod)
1941 Chevy coupe
1938 Chevy coupe streetrod
Re: Coil wiring 1950 3100
Jhyp #1288033 Mon Nov 19 2018 03:54 AM
Joined: Feb 2004
Posts: 21,250
Just to muddy the waters a little more- - - - -the real culprit to reversed coil polarity is "inductive reactance"- - - -the resistance to current flow in the primary coil winding if the end of the secondary coil winding is at the distributor side instead of the ignition switch side.

Last edited by Rusty Rod; Sun Nov 25 2018 04:11 PM.

The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Coil wiring 1950 3100
Jhyp #1288342 Wed Nov 21 2018 11:04 PM
Joined: Jan 2018
Posts: 189
Shop Shark
I've never thought about too much coil polarity. Just hooked it up the way it was supposed to be. I got curious and wondered why? Stumbled on this, and now it makes sense. Tesla would have known that for sure too.

Last edited by 4100 Fire Truck; Wed Nov 21 2018 11:06 PM.
Re: Coil wiring 1950 3100
Jhyp #1288388 Thu Nov 22 2018 05:35 AM
Joined: Jul 2000
Posts: 1,063
Shop Clutterist
Thanks 4100. Inquiring minds like to know! thumbs_up

1954 1/2 ton 235 4 speed

Moderated by  Rusty Rod 

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