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Old 03-31-2014, 11:42 PM   #1
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No power when running off battery

We just got a 96 Rockwood 1207 pop up trailer off a couple who inherited the trailer so they didn't know much about it other then the said "everything worked"

The trailer didn't come with a battery so I went out today and bought a deep cycle battery at Costco. Hooked it up and nothing works.......when I'm hooked up to the house everything works but when I unplug I don't get anything off the battery. Is there a switch to go to onboard power?

The ground from the trailer base to the battery looks good, the positive cable runs back to a T where it branches off to the inside of the trailer and the other to the harness at the tongue of the trailer which I'm guessing is for charging the battery while driving? I don't think that is hooked up as somebody hooked up a normal 4 prong connection for the lights but there is also 3 fairly high gauge wires just bare. Here are the pics.



Any ideas what these are for or why I don't have power with the battery?
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Old 04-01-2014, 12:22 AM   #2
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Well, first the positive should go to a breaker, then on to your converter for power distribution. That should be where that T is. If you have a test light, check for power there, both legs if it's a breaker. If power is there go check where it goes into the distribution/converter box. You should have found the problem by now if everything works when plugged in. I'm a fan of checking and cleaning connections too, amazing what a little corrosion will do. Ground side also, just cause it looks good doesn't mean it is good.

Now, your harness. That's a mess unfortunately. The four wire, if correct, is ground, stop/turn left and right, and running lights. The others? Dedicated ground and power for charging the battery, and maybe trailer brakes though many pop ups don't have brakes. I'm afraid you may have to start tracing it out unless someone can say for sure.

Good luck, keep up posted on your progress!

I just looked again, that four wire setup is just crudely added to the harness isn't it? Yeah, time to rewire that correctly.
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Old 04-01-2014, 12:28 AM   #3
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Thank you SKnight, I appreciate the reply.

First off you are right I should go thru and make sure all the connections are clean, I'll do that tomorrow. Off the battery there is an inline 20 or 25 amp fuse (don't remember) and it looked good. I looked inside the trailer under a seat and there is what looks like a converter box by my water heater but didn't see a breaker, need to double check and see where everything is located (this is my first trailer).

That harness is a mess.......I have it going to a modern 7 prong? I think connection on my Toyota 4Runner with an adapter to fit the trailers 4 plug. Wonder if I can just get the right plug and rewire it to everything on the trailer. I'll look into that.
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Old 04-01-2014, 12:33 AM   #4
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Might seem like a silly question, but are you sure you have the + and - hooked up right? When I started on here last year I scoured the various threads to learn all things TT related. One I remember running across was that some trailers are wired backwards to what you'd expect in a car so batteries were getting wired up wrong.

In other threads I learned there should be either a resettable breaker or a fuse a short distance from the battery, probably just past the front of the body, that can blow if it is wired up wrong and would need to be reset/replaced once it was wired right.
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Old 04-01-2014, 12:36 AM   #5
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Thanks Kaadk, great point! The one nice thing about this setup is that it's fairly simple to see everything. I can see the ground coming just a foot away from the battery and the positive has an inline fuse so it's easy enough to tell which is which.

What I need to see is if there is a breaker or if it's just the inline fuse that's between the battery and the converter.
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Old 04-01-2014, 12:44 AM   #6
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Figured as much but it needed to be asked. Good luck tracing it.
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Old 04-01-2014, 12:51 AM   #7
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Since your truck has a seven wire I'd just get a seven wire plug for the trailer side and wire it up. Whatever you don't have, brakes for example, just leave it empty. Your truck plug should have a charging terminal.
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Old 04-01-2014, 12:53 AM   #8
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Quote:
Originally Posted by SKnight View Post
Since your truck has a seven wire I'd just get a seven wire plug for the trailer side and wire it up. Whatever you don't have, brakes for example, just leave it empty. Your truck plug should have a charging terminal.
That's what I was thinking!
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