As mentioned, turn the switch on and check for power at the base of the mast. There should be a terminal strip or etc down there. Get yourself a cheap
multi meter or a 12v test light with probe. Connecting to neg and positive terminals should get you ~12v reading on the meter or the light should light up. If you dont have power to the base of the mast, look at the back of your electrical
switch panel. do the same thing there. at the switch or fuse holder.. etc etc.
is really simple, everything has a ground and a hot wire. The hot is usually red.