Bryan Markell
Member
Need correct spark plug and coil wiring for a Model A engine, may I ask who might currently be the supplier?
Model A engine wiring
- Thread starter Bryan Markell
- Start date
Joe K
Well-known member
The spark plug are the copper or brass "jumpers" that go between the nubs on the distributor cap and the screw top on the spark plug. Any jumper will work but earlier cars were one pattern, later cars another.
The "hot" wire between coil and distributor top is available from suppliers. Originally without "hoods" or caps, many users put a modern rubber hood to "seal" the connection against entrant water.
Otherwise, coil wiring would be part of the "harness" which most every Model A supplier will sell you. And this would be separate from the headlight wiring which is sold frequently with the "switch plate" - and have quality issues all their own.
Wiring diagram with correct wire colors below.
https://lesmodela.files.wordpress.com/2017/10/wiring-diagram.pdf
Sources of repop Model A parts with online catalogs below (Google search terms)
Tams Model A
Snyders Antique Auto
Brattons Antique Auto
Berts Model A
There are others.
Joe K
The "hot" wire between coil and distributor top is available from suppliers. Originally without "hoods" or caps, many users put a modern rubber hood to "seal" the connection against entrant water.
Otherwise, coil wiring would be part of the "harness" which most every Model A supplier will sell you. And this would be separate from the headlight wiring which is sold frequently with the "switch plate" - and have quality issues all their own.
Wiring diagram with correct wire colors below.
https://lesmodela.files.wordpress.com/2017/10/wiring-diagram.pdf
Sources of repop Model A parts with online catalogs below (Google search terms)
Tams Model A
Snyders Antique Auto
Brattons Antique Auto
Berts Model A
There are others.
Joe K
BRENT in 10-uh-C
Well-known member
Bryan, before we go too far, ....define 'correct' as it pertains to your question. The two reproduction items that you are asking about are not "authentically correct" in all details as compared to original OE supplied pieces if that is your goal. It is the length on the spark plug wires, and the sheath on the coil wire that is the differences.
Bryan Markell
Member
Thank you for the responses. With your help the question has been satisfied.
Joe K
Well-known member
High tension corona dissipative discharge points.
Similar in effect to the top point of the lightning rod on your barn.
I have used a metal paperclip when one of the brasses went missing.
Joe K
Ray in La Mesa
Well-known member
It's not original but it works, it will bite you even when the engine isn't running! I have it on the #1 spark plug in my 86,000 mile '28 roadster pickup just to make people smile.