Just an update...I discovered that I was getting no voltage at the inertial switch (or where the initial switch was, as it has been jumpered around). Fuse was intact in fuse box, but battery side of the fuse was only getting ~0.43 V; a couple of minutes later, 12.1 V (my battery is a little low right now), when the key is in start position, but after trying to start again, back to 0.43V. I am going to go through the tedious process of tracing lines to see if I have poor contact or another path to ground somewhere, but voltage should be the same as the battery if there is no current, so I am at a loss. Any ideas before I start pulling tape off wire bundles on the way to the battery?

Thanks for all your help