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The cover over the electronic ignition parts on my Chrysler 440's has a schematic that I need to wring out a problem where my starboard engine will run for a while - 40 to 50 minutes and then die. I can restart and as long as the engine is running above 1000 RPM is runs ok. I'm sure it's electrical, but I've replaced the ECU, voltage regulator, ballast resistor and had the alternator overhauled. I'd like to trace all the wires to see if there is something mis-wired. Does anyone know where I can get a copy of that schematic?

How old are the engines? Is the electronic ignition original or an add on?

If it is an add on, it might be easier to purchase new kit and go from there.

Do you have the 5 pin module?

The engines are 1973 with original electric ignition. The parts of the schematic that I can read are under the plastic cover for the ignition parts. Yes I have the 5 pin ECU module.

Looks great, thanks. I'll head to the boat today and check it out.

You did not say that you had replaced the coil. Swap coils between the two engines and see if the problem follows.

What is voltage across coil when engine running at say idle, then at 1500rpm? Think it should be less than 10 volts.
When engine dies is coil hot to the touch? If so probably voltage to coil is too high

I changed the coil yesterday and have run almost 2 hours without a shutdown. thanks for all the help. But I will check the voltages today to make sure I am not having over voltage at the coils.