What you have there are 3 cicruit brakers and fused feed lines. Check the rating on the circuit brakers and make sure the fuses are no more than 80% of the total of the circuit berakers. If the wire going into the brakers is #12 than the fuses should be no more than 20 amps. Can't tell from the pictures as to the wire size.
The red line should be the hot line and the white line is the ground.
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles