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I checked with my friend, coils measured 4700 ohms, book says 8000. Voltage at ballast resistor was 10.8. After some cleaning up and such it measured 13.7. As previously mentioned the issue is intermittent, I bought the car 2 years ago and I have had this problem off and on since I got it. It...

Another observation. I thought the engine would sometimes hiccup for a split second as I turned the key through run after giving up on cranking. My friend observed that the engine hiccups at the moment the key goes into the off position, not run.

Coincidentally, a local Superbee owning car buddy of mine who was a mechanic and recently retired as a United airline mechanic came by Friday and tested a bunch of things. He thought the spark looked weak when I cranked and he checked with a wire disconnected. He found a voltage a little low but...

The thought of the pickup/reluctor gap or pickup did cross my mind. I have a Challenger in storage that a few years ago when I went to start it, cranked but wouldn't fire. My friend who manages the storage building has a buddy who is a retired fleet mechanic and they dug into it a few days...

I've wanted to try that, as I sometimes get a "hiccup" after I stop cranking and rotate the ignition cylinder through the "run" position to off, like maybe a cylinder or two get spark then. It would be interesting to see if it starts by jumping the relay with the ignition in run. The car has a...

So is the switch in the ebay link I posted the one I would need if I want to throw another part at my problem?

I've been chasing an issue with a intermittent crank but no start with my '78 Magnum since I bought it a couple years ago. Most recently it isn't starting at all. Being mentally challenged when it comes to electrical issues I've mostly alternated between scratching my head, and throwing a few...

There’s a couple pictures in this thread showing the connections. I have a couple dead restoration batteries stashed away I want to try to gut but haven’t got ambitious enough yet… Restoration Battery, red top

Are all vintage style Mopar coils correct to work with .5 ohm? I didn't look at the coil closely but I think its an aftermarket one. My spare ones are like this one Ehrenberg is selling https://www.ebay.com/itm/225616776192? I don't doubt I've had some fuel issues this year, but I've had the...

In throwing parts at the problem, I’ve previously replaced the ECU, and the ballast resistor several times. I’ll work on further grounding the ECU. I’ve got spare coils on the shelf so I can try swapping it also. And I’ll look at the bulkhead connection. Thanks! :thumbsup:

I believe we were getting 5.5V to the coil when cranking (with the coil wire removed to keep the car from firing). Plugging and unplugging the coil wire back in afterward, my friend noted that it hadn't been plugged in completely. He wondered if that had contributed to the issue. I can't say...

We also measured the ballast resistor pins, upper left was 5.5v in both run and crank, the other 3 were 11.1 v in run and crank. Coil wire removed so run was just in run position of ignition, not actually running. With the newer type ECU boxes, my understanding is that the top half of the 4 pin...

I've had a very frustrating intermittent starting issue with my 360 powered '78 Magnum ever since I bought it nearly 2 years ago. It will crank with not even a hiccup some times, then after several to as many as 5 or 6 attempts at cranking, decide to fire up. I went through a period last month...

Which wiring harness is it that has the plugs that plug into the 4 prong ballast resistor? I thought maybe the engine harness but pictures of engine harnesses don’t have those plugs. My car has been dogged by an intermittent starting issue that I suspect ties in with this wiring. I’m really...

Thanks for all the ideas! I don't even have a functioning volt meter right now, but I will see if I can get my buddy over with his to spend a little while troubleshooting with me this weekend!

I've had an issue with my '78 Magnum when starting it. It's a 360 4 barrel, all the lean burn gadgetry is gone. Often when turning the key to start it, the starter cranks but nothing happens, not even a hiccup. Though when turning the key back out of starter mode it will often hiccup briefly...