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Old 09-10-2016, 12:04 PM   #1
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battery in cab is going dead.

Hello all. I am having trouble with my cab battery going dead. I have had our rv for a year now and just now started having problems. I just replaced the old one a month ago thinking it was just time. I just went out there a month later and the new one is dead again. I always keep it plugged in to shore power, so I dont know why it is draining the battery. House battery is fine. Any suggestions? I have a disconnect switch near door that i have never used before. Just FYI. Thanks for any input.
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Old 09-10-2016, 12:18 PM   #2
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If your RV does not include a connection from the installed charger to the cab battery you can install one of these to maintain it; Ultra TRIK-L-START Starting Battery Charger/Maintainer

The switch by the door disconnects most draws on the house battery but is not for long term storage.
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Old 09-10-2016, 12:32 PM   #3
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Start with the easy stuff making sure the doors are closing all the way, the lights(interior exterior) and radio are off etc. If no luck you can see how many amps are being drawn from the battery with everything off. You can do this with a (DVOM) Digital Volt Ohm Meter. Pretty much what you do is disconnect you negative battery terminal and and put your DVOM between the ground cable and battery terminal and check the draw. If it is excessive you pretty much start pulling fuses until the draw stops. When it stops you have found your problem area. You will want to research how to do this online as it has been a long time since I have done this and could be leaving something out. It will also be more complicated with a motorhome since Jayco has tapped in to the Ford wiring harnesses. Good Luck...
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Old 09-10-2016, 01:04 PM   #4
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Thank you. I think it is the radio but not sure why it took this long to drain the battery.
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Old 09-10-2016, 02:10 PM   #5
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The chassis battery can go dead after a month of sitting due to parasitic drain. Like you said, the radio would be one and believe it or not the transmission has some parasitic draw. Shore power doesn't charge the chassis battery. I use a Battery Tender to keep mine charged whenever my rig is parked.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

I made my own plug so I could plug it into a cab power port without having to hook it directly up to the chassis battery.
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Old 09-10-2016, 02:31 PM   #6
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Thank you. Any chance you have a pic of plug you made. Definitely getting this.
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Old 09-10-2016, 04:27 PM   #7
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I just looked on Amazon and they now have these. The wire from the Battery Tender has a plug that will work with this.

https://www.amazon.com/BATTERY-CHARG...F4ED2ZAEE32GQ7

I didn't know about those when I adapted mine. So that's really an easy way to go.
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Old 09-10-2016, 04:36 PM   #8
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I saw these but am curious as to how you supply the AC power?
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Old 09-10-2016, 04:39 PM   #9
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My rig is plugged in all the time so I just plug the Battery Tender Jr. into an AC outlet over the cab. The wires that come with the Tender are quite long. I edited my previous post several times so go back a couple of postings to make sure you get my latest info. I also have a four way splitter so I can add other stuff to my power point plug such as chargers and GPS.
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Old 09-10-2016, 04:59 PM   #10
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Ok. Thank you.
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