Most likely from fiddling around under the dash.
A side story: I was just under a year living here, going home after work, got involved in a seemingly uneventful wreck. No damage to Mean Green whatsoever. I drove to my hometown, got my cousin to join for some beers up on the mountain, and the truck would not start. Granted, it mid-December, and COLD! This was around 2200 hours. Luckily it was a full moon. Option 1) Walk. No effing way, we'd freeze. It would be easily a 6 hour walk or more. Option 2) Drive the truck down. How? Very carefully. In the mountains, and when the vehicle has a manual transmission, I always point it downhill. So, I devised a plan. Leave it in 1st gear (sm420), and ride the brakes until they felt like they weren't holding well anymore, then slowly let out the clutch to stop. Wait about 20 minutes for the brakes to cool down, repeat. Once we were off the switchbacks we could freewheel. That was fun! Steering was tight because of swapping in PS, brakes were fine because they were still the old drums. Made it down the winding road just fine. Last option, roll through the stop light and hope there isn't a Sheriff, Highway Patrol, or cross traffic hit or get hit by, or just pull into a parking space behind a business then walk. That's what did, parked and walked.
The seemingly uneventful wreck had loosened a connection at the bulkhead and it got hot and warped everything. So, Pop diagnosed it, discovered it was that, ran a bypass hot to the fuse block or ignition switch, I can't remember which at the moment, and I ran it like that until I redid the entire harness a few years down the road.