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No more Tech 2 communication problems. It's been more than a month now and the problem has not happened again. I took the old switch apart to look at the contacts and of the 8 sets 3 were significantly pitted and burnt and 2 others looked like they were starting to pit. I guess when I cleaned...

I finally replaced the ignition switch, with the AC Delco of course, and it hasn't done it since. Before I changed it got to where it was happening at least once a week. It has only been a week since I changed it so it hasn't been much of a test but so far so good.

My grounds are good, I made my own with 8awg wire connected to both negative cables at the intake manifold then directly to the frame,the firewall and the right rear intake bolt where all of the grounds are connected. This fixed my jumpy speedometer a while back. I had trouble with my ignition...

Occasionally when trying to start my Suburban the glow plug light doesn't come on. No amount of cranking will start the motor either so I believe the fuel solenoid is still shut off. When I connect my Tech II it says it can not establish communications with the vehicle. I have tried swapping out...