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Hi I'm Wayne
I will try to help you with this
what is the battery voltage of your coach battery ??
Yes you need to be there to measure the voltage at the battery
you can not guess what volts are, need to be exact
looking for 12.9 to 13.2 volts
Later is fine , bring a volt meter
Ignore the JA questions, they are Generic
fluid has nothing to do with the no start
so you are saying that the engine does run???
but trans won't go into gear, and trans control board is out ??