If you are asking about the 2 wires on the electro-magnet, it doesn't matter. There is no power and ground. The electro-magnet is an insulated coil and does not come in contact with the ground of the trailer. So polarity there is not important.
You can connect a battery or charger to the two wires of the brake coil, put a screwdriver in front of the electro-magnet, and you can feel the electro-magnet. It will magnetize your screw driver too.
The back brakes on my 2 axle trailer stopped working. Something had cut one of the wires feeding the back axle.
Get a volt meter and find where the voltage is missing. Try this, pull the safety cable and see if the battery will energize the coils.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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