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Your brake wires from the pinbox look just like black or brown two wire cord coming out of a table lamp. As stated earlier, one wire is +DC power ... the other is - ground. It makes no diference as to polarity as long as you have one brake wire going to plus and one brake wire going to minus. Behind each wheel on the street side will be 4 wires (2 each for the street side brakes and 2 each for the curb side brakes that run thru the axle. The front brake wires are hooked to a pigtail wire coming off the pinbox feed wire ... the rear brakes again 2 wires for each brake are hooked directly to the pinbox feed wire. It's good practice to solder the connections and waterproof them with say liquid tape made for automotive use. However ... crimping works too as sadly that's how most RV's come from the factory.
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