Good Sam Club Open Roads Forum: Tech Issues: Power "vampire" on coach batteries
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 > Power "vampire" on coach batteries

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ktmrfs

Portland, Oregon

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Joined: 06/22/2005

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Posted: 10/23/21 09:14am Link  |  Quote  |  Print  |  Notify Moderator

Gjac wrote:

ktmrfs wrote:

Gjac wrote:

I would disconnect the neg battery terminal and set your muti meter to 10 amps with one lead on the post and one lead on the cable. This will tell you what your parasitic draw is. If over a couple of amps something is left on . If you do this simple test first and post what your draw is you will solve your problem. As a data point my parasitic draw on my chassis battery is .4amps. If less than 1 amp I would check the cells in your battery.


couple of amps is WAY to high. if everything is off, draw should be on the order of 0.01A or less. Even 0.4A is going to discharge a battery bank faster than you want. That's about 10Ah/day
As I said in my post if you have a couple of amps draw something is left on. However I misplaced a decimal on my parasitic draw, it should read .04 amps or 40 milliamps. On a newer MH with radio, satellite ,GPS systems, Wifi and other electrical stuff the draw will be higher. For OP's batteries to go dead in 10 days something is left on or batteries are bad. If after you check the draw and find it more than an amp or two you can then go to your 12v fuse box and start pulling fuses one at a time to see which one reduces the draw.


Lots of vehicles from the last 15 years or so will go through a shutdown process over around 20 minutes or so. But to get to that state it requires doors shut, ignition off, hood closed, no kefob nearby, etc. making it hard to actually measure standby current. But it will drop to the 10-40ma range.


2011 Keystone Outback 295RE
2004 14' bikehauler with full living quarters
2015.5 Denali 4x4 CC/SB Duramax/Allison
2004.5 Silverado 4x4 CC/SB Duramax/Allison passed on to our Son!


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