I does sound like a sticking switch. When you extend the slides and they all have gone completely out and the switch is still trying to extend more, just bump the switch to the retract position and see if the pump motor stops. If it does, that will confirm you have a sticking switch. Is this actually a 2002 Montana? Is this a Montana Mountaineer travel trailer? I'm also thinking this could be a bad Trombetta reversing solenoid.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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