Is + wire that goes to coil a resistor wire?

Does anyone know if that + wire that goes to the coil from the engine harness is a resistor wire?

Thanks

 

Some older points ignitions used an inline ballast resistor. If a ballast resistor isn't present, then yes, the positive wire to the coil has resistance built in, and can be measured when keyed on.

Devon

 

So,that would`nt be a good place to get 12v source for the MSD box correct?

Thanks

 

Your 12 volt source for an MSD box should come direct from the battery.

 

The one that goes to the battery is the thick red wire off the MSD box,the thinner red one is suppost to go to a 12V switched source to turn the box on and off,thats the one i`m refering to.

Thanks

 

George if you are going to run an electronic ignition, be it msd or just a late model distributor, then you need to get rid of that resister wire all together. It'll only be about 9 volts there.

I removed the harness block under the master cylinder, pulled the plug out that had the resister wire on it and soldered a new wire to it. Ran that to the where it T's with the starter's "start" wire. I left the resister wire in the harness just in case I ever went back to points. :TU:

 

I don't believe the actual wire (pink) that attaches to the coil is the resistance wire, it's in the one the pink coil wire branches out from that comes out of firewall that contains the resistance properties.


Your basic generic ignition diagram.


Starter engaged, full 12 volts to coil.


Run position, approx. 8 volts to coil.



That's the way I understood it.
I replaced my pink wire to the coil with a piece of regular pink primary wire since the old one was cut at one time for a new terminal, and was stretched tight.
Do I have it wrong?


Edit: (looks like David beat me to it in posting.)

 

David, Where is that "T" with the start wire actually located? I have a 69. I think the start wire is purple right? How did you find which wire on the junction block was the resistor wire? How did it pull out without breaking? Does it stay attached to a spade? This location would have 12v at both crank and run position correct?

 

Ken the tee is in the harness that goes between the passenger valve cover and the intake. It's about half way. Mine was just above the center bolt of the valve cover inside the harness.

 

Larry, David, thanks! This electrical stuff is a real learning experience for me. I like grease and bolts. Wires intimidate me.

 

To add my experiences for one of the original questions: I used my old resistor wire for my 12 volt switched source for my MSD box and it has worked perfect ever since I had it on. No problems at all.:beers2:

 

Well, that was the question asked.

The one that goes to the battery is the thick red wire off the MSD box,the thinner red one is suppost to go to a 12V switched source to turn the box on and off,thats the one i`m refering to.

Thanks

 

Ya but I bet it don't like it. p

 

Works fine for years so far on mine. Why go to more trouble than necessary if it works?

 

The smaller gage red switching feed wire for the MSD boxes is set to work correctly with voltages between 6 to 16 volts. It's in the instructions.

Regards,

Milton