Here's what you need to if your RV has an optional battery boost:

If your chassis battery is dead and you need to get your coach running again, you can use your house batteries to jump off your battery
Hold down on the battery boost button and start your engine
If it doesn't start up, release the key and continue to hold down the switch
Wait a minute or two to provide enough charge to fill your battery

To learn more about your battery booster, watch the video tutorial.

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