When the POpo is behind you for no lights. Happened to me once on my way to G. Marker light connecter came loose and grounded to the frame. Blew the fuse on the truck. Cop let me proceed with the hazards on the truck going. Luckily it was a flatbed and only had me J&J car on it.
Cleaning the connections would be a good start.
You shouldn't have a cable going to the chains. If what you're talking about is the tether for the break-a-way switch, it needs to be attached to the truck when you hook up. NOT to the chains. To the truck receiver.
Your setup is already "ready" to be cleaned up.
Run the new connector/pigtail to the junction box where the battery is.
The little 2 wire black box on the top of the rail is the break-a-way switch for the brakes. It, and the battery, energize the brakes in the event you lose it...
Trailer...
This is a specific request from a potential customer of our equipment. Without very specific program files (proprietary) it's useless. Our customers have the gateway to plug into the machine, but we don't give them the files unless diagnostics are needed remotely.
This request is mostly...