Hello all

It's a dumb question, but not worth losing a machine over.

I moving machines around, and to use my rail system, I have mounted power to a piece of wood, when I moved a machine, wood and power fell on floor, so wires disconnected, so here the question, does it matter how wires connect? There no +/- showing, and wires seem to be same color on every machine, but again, it's not worth losing a machine over if I screw something up

Thanks in advance