What would drain the engine battery on our 2017 class c? Went to unlock the doors on our class c mh with the remote and zilch....tried the auto door locks from inside and zilch....put the charger on the engine battery and started the engine to let it run. It has been stationary for a few months now.

Just a guess, the radios memory draws about 50mA and over a few months will deplete the charge on the radio. I added a switch to allow me to turn off the memory when I think I may not be using the M/H for more than 30 days.

Radio, OBD/PCM, most likely culprits. Courtesy lamp under hood with faulty mercury switch, if there is one there, or else where. Apparently some power electric steps can draw current from the chassis/engine battery. Door not closed dome light? Lots of things can do it over a few months.

With all the engine computers with memory the battery will go down in a few days. Twenty plus years ago the batteries would hold for several weeks.Dusty

Not uncommon for modern vehicles for the battery to discharge when not started for over a month.

If you leave the fob inside it, that can cause it to drain quickly.

Engine battery | Good Sam Community

Dusty_R
Explorer
Feb 28, 2018
With all the engine computers with memory the battery will go down in a few days. Twenty plus years ago the batteries would hold for several weeks.

Dusty
MDKMDK
Explorer
Feb 28, 2018
Radio, OBD/PCM, most likely culprits.
Courtesy lamp under hood with faulty mercury switch, if there is one there, or else where.
Apparently some power electric steps can draw current from the chassis/engine battery.
Door not closed dome light?
Lots of things can do it over a few months.
Sloop_Smitten
Explorer
Feb 28, 2018
Just a guess, the radios memory draws about 50mA and over a few months will deplete the charge on the radio. I added a switch to allow me to turn off the memory when I think I may not be using the M/H for more than 30 days.

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