[Former StClairSailor]

You don't indicate what year or model your Montana is. I have a power cord reel and the only time it failed was due to low battery voltage. If you have a volt meter, put it on the battery terminals and have someone press the power cord reel switch and see what it does. Another way to check, if you have a level up system is to look at that voltage and see what happens to the battery voltage level when the switch is pressed. Best of Luck.