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First, how can your gearbox stop the engine starting?
It was my understanding that if the 'box is in anything other than P or N, then the engine won't start to avoid damaging the box. If, for some reason, the ECU isn't being told the 'box is in P, then wouldn't it step in to prevent a start?
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Focus on the starter and the connections associated with it. Check battery connections, earths, cables at the starter,esp, the main (thick) cable. Make sure all are secure (not loose) and reasonably clean.
I do suspect there's a bad earth somewhere, but I'm damned if I can find it. There's a couple of instruments that read badly and generally suggest that there's something going on somewhere - like when I indicate, the battery reading and the RPM's tick in opposite time to the indicator...
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I guess it's sludge-o-matic? Maybe the proveout is faulty, you mention slipping into a neutral (?) and it started/ Badly adjusted proveouts can behave this way. You need to do some basic diagnostics to rule out some possible causes before you can end up with the probable or definite cause.
I'd look at it for you but I guess you are not near me so that's a non-starter (another pun, eh?)
Cheers, Martin
Sadly, I'm down in Torquay, which I think is pretty much miles from any US specialists. Cheers Martin!