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Old 08-26-2014, 03:40 PM   #1
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Question Trailer battery not charging while towing???

Looses charge if refer on battery for a few hours when driving. New battery (2014), 2012 Bambi, battery recharges when on shore power. Ideas....
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Old 08-26-2014, 03:53 PM   #2
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Have you checked your umbilical cord's 7-wire connector to be sure the terminals are clean and not corroded?
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Old 08-26-2014, 03:57 PM   #3
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How much does the refer draw? The umbilical doesn't supply a lot of power. I checked mine with the Trimetric monitor and my particular truck only supplies 10 available excess amps over and above any other loads that are operating while under way. It supplies a total of 13 amps but other stuff is on, like refer board, propane detector, etc.

If the refer heating element draws more than 10 amps,(which I'm sure it does) you are operating at a deficit
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Old 08-26-2014, 04:04 PM   #4
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The heating element only works when you're plugged in shore power. Normally when traveling you'll be on propane when the refers on.
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Old 08-26-2014, 04:06 PM   #5
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I was assuming OP has a 3 way and is running on 12V cooling??? Maybe not??
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Old 08-26-2014, 04:10 PM   #6
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I was assuming OP has a 3 way and is running on 12V cooling??? Maybe not??
I thought that too, but I noticed he has a 2007 model and I don't think 12v was an option then.
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Old 08-26-2014, 04:13 PM   #7
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If it's a 2 way, I can't fathom why the refer would draw the batt down. I guess we need to know if he has a draw down ONLY when the refer is on. The refer draws very little amperage when on propane....like milliamps
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Old 08-26-2014, 04:17 PM   #8
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If it's a 2 way, I can't fathom why the refer would draw the batt down. I guess we need to know if he has a draw down ONLY when the refer is on. The refer draws very little amperage when on propane....like milliamps
I think it's something other than the refer drawing the battery down.
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Old 08-26-2014, 04:23 PM   #9
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but I noticed he has a 2007 model and I don't think 12v was an option then.
My apologies. The OP has a 2012, not 2007. For all I know he does have a 3-way refer w/12v power.
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Old 08-27-2014, 11:36 PM   #10
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Originally Posted by acstokes View Post
My apologies. The OP has a 2012, not 2007. For all I know he does have a 3-way refer w/12v power.
My 2012 is a two way.
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Old 08-28-2014, 01:09 AM   #11
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I doubt that the poster has a 3 way refrigerator, so the current draw should be in the range of 0.3 to 0.5 amps (when the fan is on, I think the sport 22 has a fan). At any rate not enough to draw the battery down that fast, unless it is virtually discharged anyway.

Test the tow vehicle plug for 12 volts available to charge. It may not be hooked up or something may be wrong with it.

If it is a new battery, it should not discharge in a few hours, especially while driving. You could have a defective battery, even if it is new.
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Old 08-28-2014, 01:12 AM   #12
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Second thought: on shore power, are you putting the use/store switch in USE. That is the only way it will charge when plugged into grid power. In other words, are you sure you are starting with a charged battery?
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Old 08-28-2014, 09:29 AM   #13
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Cool Thanks

To all for prompt response: Refer is 3 way & we would only use the batt mode while towing (propane flames out due to wind). We are fairly sure that we have
used the batt mode w/o discharging the batt while towing...this issue just started a couple of weeks ago on our way back to the lower 48 from AK.
I have used contact cleaner on the 7 wire. Is there another way to clean the contacts? I think the answer maybe that we are running a deficit which when the battery was new it could overcome. The Dometic refer specs are 12 V/11 amps. I am (usually) handy...
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Old 08-28-2014, 09:54 AM   #14
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Do not know what it takes to run a 12 ref. I do know that I ran my batteries down to 12.2 v and then pulled the trailer for 6 hours. At the end they were still 12.2 volts. Only thing running was propane refig. and I used the water pump for 15 seconds at one stop. the TV just does not put much charge back on the batteries.
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