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Sounds like the batteries need some attention first..........and then check the shortstop breaker near them to see if that tripped as that will cut off the power to all the rest of the system. I am attaching a link to one so you can see what they look like. Most are manual reset and that black button on the end has to be pushed in. If you overload the system, that trips out just like blowing a fuse. Please get back to me if we need to dig deeper into this as all follow ups are included in our fee. No time limit. http://www.surplus-electronics-sales.com/images/medium/122-1012%20Short%20Stop%2028V%2030A%20CB%20sm_MED.jpg
It would be on the end. Some are auto reset and those are usually silver colored. If you have a 12 VDC test light you can see if there is power there getting through it. And if the batteries are over 3 years old OR have been boiled dry and have little water they may need replacing.
Or jumper around that and see if power is restored.
IF the reverse polarity fuses in the converter are blown you won't have power either...........usually two 30 or 40 amp blade fuses.
The lead from the truck goes right to the batteries. If you were pulling too much amperage from the truck and the batteries were bad or all the way discharged, that shortstop breaker acts as a fuse.
Hopefully, that is all that went wrong. Replace it and see.
And have the batteries load tested to be sure they are good..........they may not take a charge.
Use the largest ones you have room for.............golf cart batteries are the best in series and then two 27 series 12 VDC batteries in parallel would be next best. Slide rooms take a lot of power.
Just checking back in to see if you got this resolved or do you still need some additional input from me?