Technical Flathead wiring

Here is a drawing of the wiring I have setup to test fire a 52 flathead with a new 12v internally resisted coil. I'm not getting any spark to the plugs, but the engine cranks over fine. New rotor, cap, wires and plugs. Could it be the points? Is my wiring correct?

Thanks


Drive fast & take chances

 

Remove the ground wire from the neg on the coil.You should only have the wire from the distributor on the neg side.

 

pretty sure that ground wire going to the coil is your problem, try it without it.

 

Your grounding the coil

 

What they said. Your coil is shorted directly to ground causing it to discharge into ground and not through your points for a spark.

 

Like they said, remove ground wire at coil. I wonder how hot that coil got?


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Should there also be a relay in the mix?

 

To elaborate a bit...the wire from coil to the points IS the ground system, grounding through the points to charge the coil, then firing the coil when the ground is removed by the points opening...so, with that terminal grounded by a wire into main circuit, points don't do anything at all and since ground is always there, your coil cannot fire.
Gratuitous extra info: Sounds like you have the original distributor...it has two electrical problem areas that need to be examined because they are nearly invisible. One is a little ground strap from point plate to body of distributor...this eventually will break from normal flexing, leaving you with erratic ground and poor performance.
The other place to watch is the small wire from coil...it goes through a plastic bushing where it enters the distributor, and this is a failure point when that bushing disintegrates.

 

Great Thanks for the insight... knew it had to be something stupidly simple. I'll check the other items there Bruce! Thanks for the tips.

 

All of what he said..

 

No relay. No way. Why would you want one in this circuit?

 

No relay in a coil circuit. Like mentioned above, all it is, is charging a coil, grounded through points, then discharging that coil through opening those points suddenly breaking that ground which causes a spark & discharge of the charged coil. No complicated circuit with relays etc. Those are generally in control type circuits.