Starting from the beginning.
Went out and started up the Bronco... boom... natural as can be. Bit of a warm-up then off I go, out to my buddy's place. Truck ran perfecty all the way out. Turned it off & went in and visited for an hour or so. Went out to warm up the truck, so we could go for a ride up in the hIlls. Turn key... cllick, click., click. click then nada .. nary a click. So, now process of elimination begins.
1. Is the battery suddenly dead? Dead cell & no cranking power even fully charged. Been working perfectly for last week. Did try to freeze in our blizzard and -30°, so I took both Bronco and Ranger batteries inside for the duration. Might have started to freeze, because when I started it, the rate of charge was almost pegging the guage.
2. Next ... The clutch always needs to be pushed in, in order for the engine to start, when key starting. Now... does that switch have to be engaged by the clutch every time, including trying to PULL START the truck? Didn't fire a lick. Should've started in just a few feet. So... can you effectively pull start a BII with that goofy clutch switch?
3. Solenoid bad? remember the click-click thing? ( am now referringmyself back to the battery.... hmmm... need hygrometer to test each cell, checking for dead cell. I think I dead cell wouldn't create much cranking amps. Am I right? Thus, the clickety click. Then, even the clickety click stopped and that was after we'd had the charger on the battery and the reading with a multimeter, just a tad above 12V. You'd think you'd at least get a clickety click!
4. Pull start attempt... Engine turns over like it should, when letting out the clutch. No firinig, no start. ( Now we're at the grrr stage. )
5. No fire to plugs, pullstarting. I guess that speaks to itself, but gets me back to the clutch "start" button. BUT...shouldn't it at least fire? The alternator doesn't appear to be that old and I'd think the alternator would provide some electrickity to the COIL, to sent fire to the plugs.
So people, I've worked on my own vehicles for many a year now,... I'm 72 and have a ton of basic experience keeping every vehicle I've ever owned startin gand running like a champ and never had a problem that shared so many possibilities of what could be the culpret.
So, we have to, apparently, eliminate the battery first. Then the Solenoid. Then the coil. I'm hoping it's not the battery!!

Any ideas people? I think I'm on the right track, but am not used to working on electronicly controlled systems, as compared to my beloved 55 to 79 trucks, where it was pretty simple to find the problem.
OK... rant over... let's hear some suggestions please.

 

I am by no means an "expert" or even close! lol But when you say no fire and because this is kinda easy i would temporarily jump over the Inertia switch. That plug went crumbly and got green on mine i had to replace it.