I've got a 75 FJ40 that has less than brilliant headlights. After replacing the headlights and not seeing any improvement I proceeded to check for wiring and connection issues. I discovered there was a voltage drop of a little over 2 volts coming out of the switch. I cleaned all the connections from the fuse block forward and shot some contact cleaner into the switch a few times. Now I'm down a little over a volt. Has anybody ever disassembled the headlight switch, cleaned it properly and reassembled it? Used switches are really spendy and are prone to the same problem mine has. If it can't be disassembled what are my options?