solar controller wiring.
There should probably not be multiple "battery+" wires from the solar controller, it appears to be abused as poorly implemented "additional power distribution block".
The "battery -" terminal needs to be connected to frame and battery grounding (at some busbar). If this is one lead from the Romex, don't do that - never use Romex in support of 12v.
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TM='06 2619 w/5K axle, 15" Maxxis "E" tires. Plumbing protector. 630 watts solar. 450AH LiFePO4 batteries, 3500 watt inverter. CR-1110 E-F/S fridge (compressor).
TV = 2007 4runner sport, with a 36 volt "power boost".
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