I'm using the 12voltguy wiring kit. It is great and was not to blame. What happened was i was stupid and hit the switch to turn on the rear locker while it was submerged in the creek at Fordyce. This appears to have caused a short that ran to the contact you see with the burn mark on it.
You won't have to worry about water in Moab, at least nothing deep enough to submerge a diff.
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1989 4Runner: Dual Ultimate (Inchworm front & Marlin 4.70 rear), Marlin Twin Stick, 1200-lb clutch, 4.88 R&P, Aussie Front, Detroit rear, 30-spline Longs, Long hub gears, ARP hub and knuckle studs & 35x12.50 Cooper STT PRO tires. Marlin rear bumper & sliders. FROR front bumper. SAS with Alcan springs & Rancho 9000XL shocks. Budbuilt Bolt-on traction bar. Custom Interior Cage by Those Guys Rod and Customs.
Moab Tested & Rubicon Approved