So quick question in regards to this same issue.
Haven't driven the truck much other than in and out of the garage as I've been working on it (lift kit install, plow install, etc). I was also waiting on the paperwork so I can title it.
Anyway, noticed the wait light was coming on periodically. Truck still started, but now this weekend, nothing. I am thinking the glow plug card has an issue so decided to do the push button glow plug bypass. Prior to install, I just ran a ground wire to the blue terminal wire on the solenoid as described. I heard the click, so assumed good. Left it on for 5 to 10 seconds, unhooked the wire, then jumped in and she just turned over, no fire. Turned it off. Put the wire back on for 5 to 10 seconds more before I turned it over, with the wire still connected. She fired right off and started to race up in speed so I turned it off imediately. I wasn't going to try again until I got some feedback.
Do I possibly have a bad solenoid again? Why would it not fire with the bypass wire unhooked, but with it on? Or am I missing something in how the bypass works? I thought it was just to ground the solenoid while you manually heat the glowplugs, but you are supposed to release prior to fire, correct?
Any insight would be appreciated.