The plain white is ground. Any white with any color tracer is positive. If your wiring is burnt, I would test with a Volt/ohm meter Or test light before hooking the camera up. And as a rule the running lights need to be on for the camera to get power.
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.