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Old 07-16-2012, 11:02 PM   #1
Junior Member
Join Date: Nov 2010
Posts: 13
Battery doesn't work unless connected to house or TV

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?

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Old 07-17-2012, 10:21 AM   #2
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Join Date: Aug 2011
Location: Attleboro, MA
Posts: 98
check for a blown fuse. If you follow the battery cable back to the trailer you will find a couple of 30amp fuse. Use a meter and check that you have 12v on both side. if you have an outside junction box then check for corrosion.

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Old 07-17-2012, 10:28 AM   #3
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Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 21,174
Three things

Circuit breaker

On older trailers a common converter was the Magnetek 6300 on the fuse board are two 30 amp fuses one of those may be blown

On more modern trailers they often use a parallex 7300 or 7300T. the 7300T is the minimum of what I consider "just acceptable" I would not approve of a 7300, IT too has the same fuse. Usually 1 or 2 30 amp, if there are 2 and they are BOTH blown, replace BOTH with battery disconnected and then re-connect.

Circuit breaker, This may be a button, often red, you need to press and release -OR- It may be a small metal can with two bolts that have wires under them.

Switch: May be marked USE/STORE or DIsconnect or AUX or BATTERY or . Even unmarked
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