1947 vs 1947-Late Models
 

Greetings,

I've got a number of 1940-1947 pickups and big trucks. Two of them are "1947 Late" configured in that the cowl wiring harness is different than the typical 40-47 configuration. The only functional difference I have noticed is that the 47 Late configuration does not have the firewall mounted CB and ignition resistor panel. The CB panel in the late configuration is mounted to the instrument panel but there is no ignition resistor.

Given that fact, how is the ignition circuit different? Is there then no voltage drop required in the ignition circuit? Are there changes elsewhere that might account for there not being a resistor? Does the coil need to be a different type/style, different condensor, etc.?

Basically, I'm looking for something that explains how the ignition system works in the 47-late verses the typical 40-47 configuration.

Thanks in advance.

Dale

Re: 1947 vs 1947-Late Models
 

I have had some coils with a resistor mounted directly on them. It had a small fiber back plate that included a terminal to attach the feed wire.

Re: 1947 vs 1947-Late Models
 

What fordyford said. The CB has the normal B, A, H terminals going left to right. The coil wire goes to the resistor mounted on the coil on a short fiber board. From the factory they did indeed use the resistor.

Re: 1947 vs 1947-Late Models
 

Thank you, Gentlemen. Would a modern can type coil with an internal resistor do the trick as well?

Re: 1947 vs 1947-Late Models
 

Yes, I'm running a NAPA IC7 coil on my 48 and haven't had problems. Has the internal resistor. My 42 and 46 have the stock CB and resistor set up.

Re: 1947 vs 1947-Late Models
 

Yes one with an internal resistor would be okay but be sure to remove the stock resistor. I use a Blue Flame coil with stock points distributor.

Re: 1947 vs 1947-Late Models
 

Copy, thanks!

Re: 1947 vs 1947-Late Models
 

Thank you, Sir.

Re: 1947 vs 1947-Late Models
 

Quick follow-on question. What are some possible reasons that the truck not fire/start using the starter but fire right up on a pull start/popping the clutch in gear start?