End the Battery Drain Game

Photo Credit: Bill Tipton

July 10, 2012
Filed under Tech Tips

After many dead engine battery episodes on my motorhome, I installed a marine-style cutoff switch in the storage area  adjacent to the battery compartment. Putting the cutoff switch in the storage compartment makes for convenient access. I close and lock the RV door, let the steps retract, and then turn the cutoff switch and close and lock the compartment — reversing the procedure when it’s time to get it out. I had a service center run the hot wire from the battery to the cutoff switch, and then up to the engine. You must put the cutoff switch on the hot wire to get complete cutoff. This is so much easier than finding all the parasite battery drains! Oh, don’t forget to also engage the coach battery cutoff, if so equipped.

– Jon Grunzweig | Mission Viejo, Calif.

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3 Responses to “End the Battery Drain Game”

  1. Scott Thompson on July 10th, 2012 12:07 pm

    Since my motorhome is connected to shore power while parked at home, I use a battery maintainer to keep the engine battery charged. The converter keeps the coach batteries charged.


  2. pdmac1946 on October 13th, 2012 9:01 pm

    I installed battery switches right on the batteries under the hood of my class c. Anytime I park it in storage I open the hood and turn the batteries off before I leave. I found the battery switches at Auto Zone.


    David haynes Reply:

    Yep, I put a heavy duty knife switch on the ground lead of the engine battery. If I’m not using the motorhome, it doesn’t drain. Why in he’ll don’t the MH manufactures warn their customers. Not a word in the owners manual. Dah! So, I think I have another ruined battery. Guess I’ll charge it again, flip my switch and in a few weeks, check and see if the engine battery is Kaput again.


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