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Open Roads Forum  >  Travel Trailers

 > Battery doesn't work unless connected to house or TV

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paulitzlee

Sacramento, CA

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Posted: 07/16/12 09:42pm Link  |  Print  |  Notify Moderator

I have a Fun Finder X-139, the smallest model. I have one battery I keep on a trickle cell charger all the time except when I'm camping

If the battery is hooked up to the trailer, and either:

RV hooked up to house or campsite current
Trailer electrical hooked to TV for towing, like for lights, turn signal, etc...

The RV interior lights work. But if the battery is connected without an external hookup, either house current or TV, then the interior lights do NOT work.

The battery is fine. It was checked at Batteries Plus. It is fully charged and holds a charge fine.

It is hooked up to the trailer fine. Positive to positive, etc...

This will be an issue if we ever go dry camping.

What kind of things should I look for to solve this problem?

hmknightnc

Wilmington, NC

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Posted: 07/16/12 09:47pm Link  |  Print  |  Notify Moderator

Battery disconnect switch turned off?

Check for a good clean solid ground although I doubt that is the problem if the converter or pigtail is providing power when hooked up as you describe

fastpete

Somewhere in West Texas

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Posted: 07/16/12 09:48pm Link  |  Print  |  Notify Moderator

Possibly a battery disconnect switch.

clearnetedm

Alberta

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Posted: 07/16/12 10:55pm Link  |  Print  |  Notify Moderator

Follow the battery leads as far as you can. You should find an inline fuse and or a fuse/relay box attached to the frame. Cant recall what that one is called. I suspect there might be a fault there. Seeing you have power when on 120 i suspect your converter is working fine.

Good start might be to check the power readings on the 2 battery lines when connected to 120. should tell you if you are getting power fromthe converter.


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Golden_HVAC

Fulltime, CA, USA

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Posted: 07/17/12 04:21am Link  |  Print  |  Notify Moderator

clearnetedm wrote:

Follow the battery leads as far as you can. You should find an inline fuse and or a fuse/relay box attached to the frame. Cant recall what that one is called. I suspect there might be a fault there. Seeing you have power when on 120 i suspect your converter is working fine.

Good start might be to check the power readings on the 2 battery lines when connected to 120. should tell you if you are getting power from the converter.


Yes I have the same suggestion.

Probably the + battery terminal once touched the frame while the RV was plugged in, and grounded out the converter output, tripping a 30 - 50 amp inline fuse, and separating the battery wire from the rest of the electrical system.

Once you find this fuse, then a 40 amp automatic re-set circuit breaker should be installed. This will heat up quickly and stop current flow if the wire shorts out, but will cool off in about 15 minutes and allow current flow again once it is cool, so no need to replace the fuses.

Good luck!

Fred.

tnscoutr

Memphis, TN

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Posted: 07/17/12 11:14am Link  |  Print  |  Notify Moderator

I had the same symptoms. The fuse looked good, but testing showed it to be bad. New fuse and now all is good.


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