I wasn’t getting spark and found I had a bad coil which I replaced. But still no spark. I disconnected the coil and read the voltages on the wires to the coil (ignition on) and got readings of 2.65V on the plus lead and 4.1V on the minus lead. Shouldn’t I get 12V on the plus and should there be any voltage on the minus side? Full disclosure, this is for a 88 Dodge Van 3500 which has been sitting for over 10 years. Suggestions for trouble shooting appreciated.
How is the ignition system configured? I have a sort of similar era Corolla & it uses a conventional distributor with shaft-sensors read by an electronic spark module when to fire the sparks. Is yours similar?
If it is of any help, my 50 year old Ford truck’s coil + input is around 8 volts when engine is running as I recall, and the - input is the coil case, which is connected to chassis ground. But that may have no bearing on your particular Van.
If this van has throttle body fuel injection, the ignition coil will only have power while cranking the engine or while running. Check the voltage again while cranking the engine.
Possible bad Ballast Resistor, Mopar’s are notorious for them going bad…
OK, thanks for the ideas. I’ll do some more investigating.
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