3 wires from trailer to battery

[oldandugly]

There are 3 wires coming from my gulfstream travel trailer to my battery. They are Red, White, and Blue. The white is the ground and goes to the negative terminal, the red goes to the positive terminal, and the blue I don't know where it goes. I removed the old batteries and installed two new 12 volt batteries wired in parallel.

The red wire has a 30 amp fuse just behind the terminal connection, and the blue has a 30 amp fuse also.

I know just enough about electricity to be dangerous, but the wires are all coming from a junction box under the trailer.

I hope this is enough information for someone to help me figure this out.

[JBOURQUIN]

Does it go to your break away switch?

[oldandugly]

I don't think so. I had a break away switch on my older trailer, but only two wires. This has me stumped. I'll try to see if I can post a photo or two. That might help.


I'm new to the forum, and can't figure out how to post photos. I'll work on it.

[daynawide]

Call cross roads or where you got it from they maybe be able to help.Not that this will help when I did mine I took pictures with my cellphone because I knew I would probably mess it up.


Sent from my iPhone using Tapatalk

[mark5w]

Originally Posted by oldandugly

I'm new to the forum, and can't figure out how to post photos. I'll work on it.

How to add photos to a post

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[harley]

The blue wire confuses me ,old owner must have had that color wire in his tool box ....is there a battery switch with a knob to turn somewhere...blue could be for battery2 while red could be for battery1. That would only work if the batteries were not hooked parallel.

[mark5w]

Could it be for the powered jack?

[phoneguy]

I have 3 as well on my cruiser. The 3rd wire was for my slideout

[oldandugly]

I am starting to think it might be for the trailer brakes, although I can't imagine why. I am going to disconnect it from the battery and take a test drive. ACheerss long as the white is to negative, and the red is to positive, everything should work, except whatever the blue wire goes to. Thanks for your efforts.

[oldandugly]

I bought the trailer from a private party. I wasn't smart enough to see what terminal the blue wire was attached to when I installed new batteries. Lesson learned. Cheers

[oldandugly]

Here are a couple of photos of my battery setup. The blue wire is going to the negative terminal. No real method to my madness. 20170702_161810.jpg

20170702_161624.jpg

[Stan]

Since it has a 30a fuse, my guess is it is a power source for something and may have gone to the positive side of the battery. I would not think it would be for the brakes. Generator starting (?).

[Russb]

Originally Posted by Stan

Since it has a 30a fuse, my guess is it is a power source for something and may have gone to the positive side of the battery. I would not think it would be for the brakes. Generator starting (?).

I agree with Stan, the fused wire normally would connect to the positive terminal.

[harley]

Looks like the redneck that wired that did use what ever wire he had . Green to blue ,red to black.....scarey. I would cut all that crap off and do the proper ,thicker ,wire in the proper colour ( Color for the 4th of July) then you would know it was correct.

[oldandugly]

Not sure it was a redneck, but as suggested by Stan, I attached the Blue wire to the positive terminal on the battery. Everything seems to be working and we are sort of ready to take our first trip.

One other thing though. The pilot for the furnace is on when we are plugged into 110. We're heading to Grand Junction, and since the temp at our place was 104 today, I am concerned that even a little heat from the pilot of the furnace could make things uncomfortable. I think it is probably a malfunctioning thermostat, but i'm not sure. Any suggestions?


Thank you all for your help.

Cheers

[oldandugly]

No onboard generator, no pop outs, nothing fancy. I did hook it up to the positive terminal. Everything seems to work. This will be our maiden voyage. Should prove interesting. Thanks.