30 amp power centre w/converter/charger

[Zanzi]

I purchased this unit to put in my K-Line Fiberglass pop up trailer. I have wired new lights and a few 110 plugs and tested the lights direct to battery they work fine. I bought the power centre and hooked all four light circuits individually to the coloured wires coming out of the back of the unit. They are for the fuse board. There was only one wire coming out for each so I connected all the white/neutral wires of the lights to a grounding bar and took that to the frame.
The lights don't work going through the unit. The fuses are good there is a reverse polarity protection fuse that's still good and apparently only can pop if the battery is hooked up wrong.
What could be my problem other than being really stupid about rv wiring. The installing instructions are of no use to a non electrician.
Any ideas out there?

[twinboat]

Find the negative wire from the converter and attach that to ground.

[Old-Biscuit]

Which make/model is this??

Battery POS and NEG connect to unit or just POS?

[Zanzi]

Thanks for your responses. I was able to figure out the problem and now it's fixed. I had it hooked up right but the fuse for the battery was faulty. Hard to tell but that's what it was. Thanks again.