Okay, progress. After the slightly different passkey reset outlined here
https://www.teambuick.com/forums/sho...269#post105269 the security light is finally behaving.
The security light goes off after a couple seconds but when turning to start there's still no cranking going on. It's odd, but I think hear a slight clicking now when I try to start it.
Looks like even with the trickle charger hooked up during all that resetting, it still drained it quite a bit. Maybe after t it charges for awhile it'll finally start. This car is such a headache!
Okay so to recap,
1. The ignition switch is installed correctly
2. The security light is going off
I don't have long enough alligator clips to run the voltage drop tests. But the battery was tested and it's good, the starter and everything worked fine before I messed with the interior, and the battery cables are good and the terminals are clean.
How do I test it the ignition switch is sending its signal? I can use my multimeter as an ammeter but it doesn't clip on.
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