Have you added anything new to your rig in the past year that was installed by some wiring? When I mounted my ARB compressor under the hood in my Gen I, I learned the hard way that I should have put a wiring loom around the wires next to it. It eventually rubbed through the insulation and shorted out some of my lighting wires making my HiBeam operate when the light switch was in the normal position and the low beams would operate when in the HiBeam position.

Off Roader
98 Montero with the Winter Package
89 Montero minty clean and reserved for overlanding trips or Cars and Coffee events
96SR (3.15:1 xcase, 35's) gone to the rust gods
96SR Build Up Thread
Old web page
Old web page