Originally Posted by 58BUBBLE
The trailer plug that goes from my Bubble to the tow vehicle has been all screwed up. The previous owner cut everything except 4 wires to run the lights with a standard 4 wire plug. My question is how do I go about making the entire system functional again? One cord goes in under the front dining seat where there is a 2 fuse block with 2 wires coming out of it. Is this where there originally was a battery? There is a second cord that runs under the body and i'm not even sure what that is for. Brakes maybe? Basically I am looking for an explanation of how the entire system was designed originally and how it was supposed to function. Also, if there is a better system I can install I could go that route.
I do have the original plug for the 110 and that works great if I can plug in. Any advice on this electrical problem would be very much appreciated.
Unless your serial number has an "I" prefix, your '57 Bubble most likely did not have a battery when it left the factory. If it did, as Kevin mentions, it likely would have been mounted on the outside front panel in a long thin aluminum box, or less likely inside the trailer. Do you have any 12 volt
lights inside your trailer other than one ceiling light? If not, you probably never had a battery in your trailer.
The wire from your car to the trailer operated the trailer's tail lights & side marker lights, brake lights, electric brakes, and maybe one ceiling light inside the trailer that ran off the tow vehicle battery. The wire under the body most likely is for your brakes. Airstream did not publish wiring diagrams in 1957
, so you will have to trace your wiring system yourself using a VOM.
You can buy new trailer umbellical cord (wiring) by the foot at a horse or utility trailer dealer or a good automotive electric parts store. Get 25' of nice heavy cable comprised of 7 stranded wires inside a heavy rubberlike tube and use that to make a new lead in wire from your car to your trailer. Use 7 prong plugs and wire it like the diagram Kevin mentions. Don't connect wires to tthe prongs you presently don't need. You may discover a good use for them in the future, such as a charging line if your later install a battery in the trailer, back up lights on the trailer, etc. In the meantime, you have the circuit there ready to light when needed.