how about this:
the steering circuit is loosing it's sensing signal from the steering tiller and is timing out. This might explain why it appears the access123 might be loosing an output signal to the solenoid, because it actually is turning it off because of loosing input from the tiller encoder?
does this sound about right?
if you have the ability to monitor the steer motor solenoid turning on and off i'm sure you have the ability to monitor the tiller encoder signal too, yes?
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