no fire to coil

[michael bucklew]

trying to start car. Was running. had problems wit ballast resistors. so, went to a non ballast resistor coil--car was running....had to replace ps box and pump.....today tried to start no fire to coil.....seems to trace to ignition switch-------do have a problem there. fan stays on when key is accessory position,,,,,,

 

[Xcudame]

Are you using points or electronic ignition?

 

[michael bucklew]

Are you using points or electronic ignition?

electronic

 

[Xcudame]

I saw another post where you think it's the ignition switch. Were you able to "hot wire" the car and start it without the switch? If so, you're probably OK.

 

[michael bucklew]

I saw another post where you think it's the ignition switch. Were you able to "hot wire" the car and start it without the switch? If so, you're probably OK.

I saw another post where you think it's the ignition switch. Were you able to "hot wire" the car and start it without the switch? If so, you're probably OK.

tried to hot wire and several other tricks. we are both perplexed. it was running when parked

 

[Challenger RTA]

Check grounds. Engine and chassis ground too.

So this is where you are at. New coil, ECM, Ballast resistor, Ignition switch.

Lets say you did the above and found it all checks out good.

The grounds can and will be a problem. If I remember correctly you addressed the problem. I will post a diagram that shows the grounds that are over looked at times.
The distributor needs a ground if it's point distributor.

View attachment 155869
As said above let's say all the parts you changed are good. It keeps going back the run and start circuit. Bad, connection or ignition ground. There is on other thing that does act erratic. Electronic components 99% of the time work or they don't. Electrical connections and components will act erratic until a complete failure.

The one thing that wasn't addressed is the distributor. The pickup coil in the distributor will act that way or the connection any connection. Even a ground

I'm going of the assumption the engine turns over with the key and hot wiring it.