1978 dodge 440 in a M500 RV runs but dies when you let go key

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1978 dodge 440 in a M500 RV runs but dies when you let go key

Home > Discussion Forum > Mechanic's Corner - Engines

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All Messages in Thread	Author	Date
1978 dodge 440 in a M500 RV runs but dies when you let go key	Don	12-25-06
When you release the key a little the engine stay runnig. I replace starter,starter relay, dual ballast resistor, ign. switch and key and with a used ecu. How does the ballast resister work so I can trace the wiring. Thanks
Re: 1978 dodge 440 in a M500 RV runs but dies when you let go key	Chuck	12-25-06
Check all of your grounds ie: harness to engine, engine to firewall, ground from ecu.
Re: 1978 dodge 440 in a M500 RV runs but dies when you let go key	mike e	12-26-06
Check all the wiring around the ballast resister.Make sure the new one is not open circuit.You say its dual ballast,does it have 4 leads wires? two resisters.Might check if it is two check with a ohm meter if resistance is the same.Usually the ballast resister lowers the coil voltage in the run mode,but the ign.switch bypasses the resister in the start position and applys 12 volts when starting.Don,t know about your setup but I think the older dodges had contacts on the starter that sent 12 volts up to the coil when starting.See if you have 12 volts to the primary side of the coil when cranking then see what voltage you get to after it starts.If you still can't find you might run a test jumper that has a 2 or three amp fuse in series to the coil positive then to the battery positive and then crank it and see if it keeps running.Be carefull and if it does run don't run to long a min. or two.I will look through some old manuals and see if I can more info. Good Luck Mike
Re: 1978 dodge 440 in a M500 RV runs but dies when you let go key	Robert	2-10-07
The problem is most likely in your ign switch,they were common to having this exact problem,is it an in dash switch or on the steering col.?
Re: 1978 dodge 440 in a M500 RV runs but dies when you let go key	Charley B.	10-28-07
Hey Don, I had the same issue with my 360 Sportsman RV. It was in the timing, fer some reason the timing has something to do with the Modulaters function. And with the timing off a tad, my engine would not stay running. Give that a try.

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