Originally Posted by wader
Yeah that doesn't really help me cause I have 3 wires, Black, red and white.
First make sure that the white is your ground. You have a grounded bolt in you battery compartment that has a white wire on it. The white wire on a trailer will always go to the negative of the trailer battery. Theblack wire will go to the positive of the trailer battery. Your problem is the red wire. I suspect that it may be the load wire for a slide motor if you have a slide or thecharging wirefrom your power convertor or the tow vehicle. If it's atallpossible, I suggest that you try totracethe red wireback to the device that it's connected to. If you can't do that, try this.
1: Ensure that the battery is fully charged and connect thewhite (neg) andblack (pos) wires to it.
2: Disconnect your 120 V shorepower so that all your equipment is working off the battery only.
3:Operate all your12V equipment, pumps, lights, sliders, fans, landing gear (if it's a 5vr) etc. If a device doesn't work when it should, connect the red wire to the positive of the trailer battery and check that the non working device works. If it does then you're done.
4: If everything works then, test forvoltage between the red wire and ground. If novoltage is present,reconnect your shorepower andcheck forvoltage on the red wire toground. Ifanominal 12VDC is present then this is your battery charging line from thepower converter.For safety reasons, disconnectthe shore power first and then connect the red wire to the positive of thetrailer battery.
5:If all the effort in Step 4, failed to provide you with any answers, thenback your tow vehicle up to the trailer, close enough that you can connect the trailer power umbilical cord to theTV trailer plug.The charge line on yourTV has to be workingfor this to give any results, so I'll assume that it is.
6:Ensure that the Shore Power isNOT connected to your trailer. Connect your trailer power umbilical cord to your TV. Measure fora nominal 12VDCbetween the red wire andground. Ifvoltage ispresent, then the red wire is the charging line from the tow vehicle. Connect it to thepositive of the battery and you're done.
7:If, after all this and nothing worked as I suggested, I'm sorry, because I'm out of ideas. Ofcourse, you could use theRed Green method andjust connect the red wire to the positive of the battery and hope for the best.