Hi all, I picked up an 81 300SD that had ignition switch problems. To get the air conditioner to work, you had to wiggle the key. Ok, no problem, replace the ignition switch... After hours of messing with it, I finally got it replaced and everything worked fine... for one day. I then had to wiggle the wiring plug to get anything working the next day, now nothing works. I cleaned up the old switch, and it worked fine... for a couple of starts. I took the new switch apart, and found that one of the contacts had over heated, and no longer made contact. So now I am trying to figure out the wiring on it so I can try and chase down the problem. I have a chilton manual, but with it I can only determine the following wires The two 30 terminals are the hot leads into the switch The Vio/wht is to the Starter and glow plug control relay The red/blk is to the glow plug relay... Is there a better source for wiring diagrams available online anywhere? Is there some common problems with the ignition switch in these models? Any pointers or help would be a big help.
Thanks, Bret