2014 tundra oem backup cam issue

Installed a JVC DDin Nav unit to a 2014 Toyota Tundra with stock backup camera. Stock camera works on 6volts power supply so i used a voltage regulator 7906 to the 24 pin camera connector which has black-cam power,gray-cam ground,red- Positive video signal and white negative signal all color taken from vehicle schematics I still cannot get stock camera to turn on.Aftermarket camera works fine and stock camera comes on with stock deck.Customer wants stock camera to work. Any ideas will be very much appreciated.Thanks

Issue resolved,Black cam power wire gets power from reverse wire which turns on the oem camera.