I smell a RAT ... could it be that a rat has chewed on the wiring?
Just remebered - had same ****ble with my patrol in Kgalagadi - Luckily I had Ivor Kruger with me and he had a "meggar"

[whatever the hell that my be] and he found the fault without stripping the harness -- it was a wire to the headlamps that chafed through where it passed through a hole in the fender ... no grommet in place. Sometime in the past somebody worked there and in fitting the spots .. never put the grommet back - Blxmze sleg mekki wat nie sy werk kon / wou doen nie.

- Now - IF I were alone in those dunes, it could've cost me my life .. all for a little grommet. THAT is the scary part of of "BAD workmanship"