On my stock 6V positive ground system, I have what appears to be an epoxy filled 6V ignition coil. Instead of the + and - symbols, the terminals are marked "Battery" and the other is "Distributor." I realize the + is connected to the distributor, but not 100% sure if the Distributor terminal actually connects to the distributor on a positive ground. The truck seems to be running fine with the exception of an occasional misfire. Hope my question is making sense and would appreciate any feedback. Steve

 

Mine is the same. Your ok. Connect the batt terminal to the wire from the ignition. Connect the Dist terminal to the wire from the distributor.

Does your coil have the mustard colored top? Like this?

 

Hello Abe. No mine is blue with a black top. Is your set-up 6V positive ground?

 

Yes it is.

 

Thanks again!

 

Instead of me typing a bunch, I found a page that describes why it makes a difference. Typically, especially since there probably hasn't been a positive ground, mainstream vehicle built in the past fifty years, coils available today are going to be marked for negative ground. This means the '+' side goes to the distributor and the 'dist' side goes to the ignition switch when installed on a positive ground vehicle.

This page was written for MG A peeps but is still applicable for your concerns. And, yes, polarity can cause misfire issues.
Ignition coil polarity

 

Beav, I don't think that is true if he has a true 6v coil made for his truck. However, I am skeptical that any mustard top coil is 6v, those came out in the '60s and were all 12v to my knowledge.

 

My two mustard tops are.....

 

Shoot, mine's a blue top and it's 6v. I don't recall seeing blue until Ford started using them on DuraSpark systems. Re: pos or neg, I guess I'll have to grab a pencil and see what happens. Haven't done that since the early '70s, when I first read about it. Just wanted to see if it was real or some silliness. (it's real... ;-) )