Need help wiring up trailer brakes

[jwindbigler]

I bought a 1975 Santa Fe CCH for dirt cheap, so I can move all of my crap back to michigan. I am having problems with trying to figure out which wire is the ground wire and which wire is the positive wire on my electric trailer brakes. Both wires are solid red. Right now I am thinking that it doesnt matter which way I wire it, as I think that they work off a solenoid. If thats the case then I know that it doesnt matter which way that I wire it, the coil is going to operate either way. I just would like some input on if this is right, wrong, or just a little skewed...thanks

Here's a couple of pics to show what I am working with

[timgreen_555]

I am 92% sure it does not matter whatsoever. use either wire for ground and hot.

I am an industrial electrical guy, so 12 volt systems are not something I am super familiar with, but like I said I am very confident that it does not matter, adn even if it doesn't work one way...Hook it up try it at low or no speed and if it works great, if not swap the wires....

Hope this helps you out a little..

Tim