I just discovered that I have a set of wiring diagrams for the 411. This is likely to be of some use for the 412.
I have uploaded all 13 pages as one PDF file in the resources section under 8cyl cars - 411.
James - I noticed that the rear screen heater is controlled by a relay, which is enabled by the ignition switch, so there's something strange going on if the engine stops when you turn it on!
David, it shows the ignition wiring and Chrysler components but there's no ignition warning lamp that I could see.
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