I think you should start with the fuses. My chilton's or clymer's manual had the wiring diagrams in the back . . . wasn't hard to follow, although the fuses were wrong . . . for that I used the diag on inside of fusebox cover. One was obviously burned out and too low an amperage rating for headlights, so when I replaced and cleaned the contacts at the fuse box, everything worked as it should. Now I have an extra headlight.

Where were you in Tampa area? I live in Clearwater and there are a lot of MBZ mechanics here. My truck mechanic would trace the wiring for you within 15 minutes and charge you minimal.

Feel free to call me, if you need to.

Torie