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I edited the title and added the engine start wiring diagram.  I am still having intermittent starter when using the key switch, the schematic should make it easy to pinpoint the problem the next time it fails.

Jim, its great that you were able to get the wiring schematic. Those can be invaluable. So you are still having starter engagement issues? Looks like all you have left is the key switch. It looks like the K23 relay is only for the ECM, so that would only cause issues with the engine not starting, but it would still crank. The other reason I would say that is that both the front and rear start switch rely on the K31 relay so I do not think that would be the issue if it only is a problem with the front starting only. Just my 2 cents.

BTW how were you able to come by the schematics? Did Newell provide them to you? I have heard there is not much for our older coaches, seems weird to me that they did not keep the schematics for our older coaches, especially since they occasionally still work on them.