|Corrosion had eaten away at this entire section. Plenty of rust and faulty connections. The R/R was relocated to under the left cover. This was mainly for ease of replacement rather than cooling, but it is probably cooler there than under the cage since heat rises and the R/R heat sink was mounted on a "ceiling" under the cage. Its new position allows it air on all sides.
After removing various parts, all of the exposed electrical tabs were cleaned with contact cleaner and a wire brush. On reassembly, WD-40 was applied to all bolts.
Photos from bottom to top show rebuilding of the battery cage after hand sanding and painting with high temp BBQ grill black.