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Old 09-22-2016, 08:40 AM   #1
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No 12v power

2003 Trail Lite MH. I took the MH with my horse trailer camping last week to a primitive site. All was well, 12v running fine. On the third day, the batteries were getting low, so I turned on the generator to charge them up, ran it for about 45 min. When I turned it off, I had no 12v power. Started the truck to make sure it worked, started fine. Generator started fine. Still no 12v. Checked all the fuses around the converter (under bedroom closet) and under the dash. No luck. Since this was an isolated camp, I decided to head home. At home, 12v is fine if MH is plugged into shore line or if generator is running. I've checked the shut off switch at the stairs. Had a mobile repair service out and he can't figure it out. Local shop says they can't help. Wait list at the next shop is at least 3 weeks.
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Old 09-22-2016, 08:52 AM   #2
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Bad battery - batteries ? Are the batteries actually being charged when hooked up to shore power, or when the generator is running. 45 minutes won't provide much of a charge for "low" batteries. I'd suggest load testing the batteries.
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Old 09-22-2016, 08:57 AM   #3
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You don't say how many house batteries you have and what they are, 6VDC series/parallel or 12 VDC.

First off, it generally takes 3-4 hours of generator time using the on-board charger to fully charge a set of house batteries depending on how low they were to start.

There could be a number of causes for no 12 VDC power so without more information it will be difficult to guess.

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Old 09-22-2016, 09:41 AM   #4
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2 12VDC parallel. What other information can I provide? Batteries are testing 12.5 - 12.6 upon return home.
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Old 09-22-2016, 09:49 AM   #5
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Inline master circuit breaker in the coach battery cables , usually with-in 3' of the batteries , my two ( one for the coach , other for the chassis ) were mounted ( hidden ) on the frame behind the battery tray. to protect the 30' run of power cables from the back of the coach to the firewall.

EDIT: BTW , Welcome to iRV2 , sorry you're here with problems.

Here's a post from a member with the same problem. Just click on the blue printing.

Battery Circuit Breaker
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Old 09-22-2016, 11:34 AM   #6
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Quote:
Originally Posted by Charliew13 View Post

2 12VDC parallel. What other information can I provide? Batteries are testing 12.5 - 12.6 upon return home.
Thanks.

How are "testing" the batteries? Just reading a meter is not the proper testing procedure for batteries.

The 12volt Side of Life (Part 1)

Read the paragraph which explains how to test batteries.

What is the sp/gr values for each cell in both 12 VDC batteries?

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Old 09-22-2016, 12:45 PM   #7
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Quote:
Originally Posted by Skip426 View Post
Inline master circuit breaker in the coach battery cables , usually with-in 3' of the batteries , my two ( one for the coach , other for the chassis ) were mounted ( hidden ) on the frame behind the battery tray. to protect the 30' run of power cables from the back of the coach to the firewall.

EDIT: BTW , Welcome to iRV2 , sorry you're here with problems.

Here's a post from a member with the same problem. Just click on the blue printing.

www.irv2.com/forums/f54/battery-circuit-breaker-309201.html
Yep,, I'd look for these!
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Old 09-22-2016, 03:06 PM   #8
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Thanks for the continued ideas. Can't find that breaker from the batteries.
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Old 09-27-2016, 09:45 AM   #9
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Update: the motor home is fixed. We took it to a repair shop that we had used years ago, about 50 miles away. It took him about 2 hours of searching and frustration, but found this little 12v circuit breaker/reset switch on the firewall, buried behind a large bundle of wires and under insulation. The reset button is about 1/8" diameter. Thanks, Dave at Lone Pine RV Repair near Washington, PA. Cole Hersee-Cole Hersee - CIR_BRKR 40A 12V Reset HWD - 30406-40-BX-30406-40-BX
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Old 09-27-2016, 10:33 AM   #10
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X2 on Dave at Lone Pine Rv, my go to guy for RV stuff. Not the best looking place, but he knows his RV's.
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Old 09-27-2016, 02:55 PM   #11
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I had a similar problem with my Tiffin Allegro. I found a breaker was tripped which fed 120V AC to the inverter/charger.
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