OMFG I haven't been able to start my 81 with the key for like 3 years. I took all the steps to diagnose HDJ81 starting issues, but nothing ever resolved it.
To top it off, after driving up to Loveland to pick up new batteries and installing them at 1am, in my tiredness I installed the RH battery backwards (fuck whoever thinks putting a red cap on the negative terminal is a good idea). So then it wouldn't start, but I didn't know whether it was because I burnt something when I put the battery in backwards or because of the original issue.
At some point in my $2300 part replacement journey I fixed the problem, but didn't know it because the main power relay was blown, but I didn't know it because I had already checked that before I played switcheroo with the battery.
Then there was a short I found at the 4WD Lo Position switch.
Anyways, my truck works like it should now. I'm having a beer to celebrate.