No power from battery to camper

[shar3890]

Wondering if anyone would have any thoughts about an issue with a used TT my daughter and son in law just bought. They can't seem to get any current from battery (which is brand new and fully charged) into RV. Traced the wires and they seem OK. Battery works power jack just fine. Can't find a battery kill switch in RV-don't think RV has one. Camper works just fine when plugged in, but won't receive any current from battery when unplugged. Thoughts ???

[westend]

Since the age of said TT isn't shared, difficult to diagnose. Most trailers have a circuit breaker within a couple of feet of the battery. Some older trailers had individual fuses that are typically in a small fuse holder.

Diagnosing electrical problems without a meter or test light is too backwards for me. As was said, Harbor Freight gives them away so little excuse for not having one. 12V test lights are also sold there: Test light

[Katdaddy]

I had on of those breakers go bad. No reset button. Not an expensive part to replace.

[neschultz]

Here’s a resetable breaker like the previous answers have referred to. The small black button on the side resets it. Mine is inside a metal junction box where the 7 pin cable connects to the TT wiring. Resettable Breaker

[ulvik]

Reset button is really really small on some of those circuit breakers so look and feel really careful! Good luck.

[mike-s]

Get a meter (even a free-with-purchase-and-coupon Harbor Freight one), and track it down, step by step. Anything else is just shooting in the dark.

[KD4UPL]

If the battery is/was connected with reverse polarity it would have blown the reverse polarity fuses. These are likely near the other 12v fuses and the converter.

[catkins]

Some RVs have a 12 volt disconnect switch somewhere inside. Mine was at foot level in the step well, I would hit with my foot, then no 12 volt. Sometimes it is an easy fix once you find the switch. Hoping it is something easy!!

[catkins]

Some RVs have a 12 volt disconnect switch somewhere inside.. Mine was at foot level in the step well, I would hit with my foot, then no 12 volt. Sometimes it is an easy fix once you find the switch. Hoping it is something easy!!

[wa8yxm]

There are two kinds of main breakers used. One is the self resetting kind
The other had both a button and a lever.. I ... had issues understanding it the first time I saw one.

An automotive test light. this is a tool that looks like an ice pick with a light in the handle and a wire coming out the side of the handle.

Hook clip to battery negative touch tip to battery positive BRIGHT good. no light make sure the bulb is properly set (I often have to reset)

Move clip to any non painted metal frame part. Same. only now you are testing the battery negative cable (likely good) and connections and the attachment point (I say likely good cause jacks work)

Now move out along the battery positive lead. Every time you find a connection test.. You may have to move the ground clip as you go.

Retest last known GOOD point if you have to move the clip (Testing ground clip)

Broblem exists between BRIGHT and Dark.

You can also use a volt meter. But this is so much faster and easier to read.

[Lynnmor]

The circuit breaker most likely has no button to push as most are auto-resetting.

With a voltmeter, trace from the battery all the way to the panel inside to see where the voltage is lost. Easy to do.

[2oldman]

Would the previous owner have a clue?

[bikendan]

Probably tripped the small resettable circuit breaker, tucked up along the A-frame.
Has a tiny black reset button you have to push.
Usually trips when battery gets connected backwards.