Need a little help. I have a 1989 Samurai, new battery,all stock electric devices.The drivers side headlight is very dim. Re-placed both headlights, drivers side still dim. Run jumper wire directly to headlight and get full intensity. Checked the only ground wire that I could find that would be for the headlight wiring harness, that ground is good. It is the ground on the drivers side harness just before it goes through the grommet on the firewall, just below the windshield cowl. Is this the correct ground? I also cleaned the headlight plug of all corrosion and applied di-electric grease. Could it be a problem with the headlight switch itself?