No rear lights - how do I test

[SDharlie]

I have my front headlights hardwired to my 52 V battery because they take multiple types of voltage. I have the same positive and negative lead at 52 V leading all the way to my rear lights which meets a voltage reducer which reduces the 52 V to 12 V for my rear lights which are just basic harbor freight trailer lights.

Since installing a new controller yesterday my rear lights are not working because I rewired most of my system. Now the rear lights are not working but I have no idea how to test if there was power from the battery to the voltage reducer because all I have is a 12 V battery tester. I do have a multi meter but I have no idea what setting to put it on to test at a higher voltage past 12 V

[Jon]

For a 52V battery, put the multimeter on a range of DC 100 or 200 volts, if there is a setting like that.

[SDharlie]

Please let me know where to put the dial and where to put the black and red wires. Thank you

[Jon]

Put the dial on DCV 200. Put the black on COM and the red on V. and be careful not to short out anything when you test the battery voltage or you will see big sparks!