Ignition wiring help

this is the firewall solenoid. what problems would this one cause? the left big lug seems to be ground, the right big lug is 12v constant, and the small stud is also a ground. this one has no 12 volt key on.

 

ah ok..so this new one I got should work for the firewall solenoid? I connected my multimeter to the 12v stud on the right on the solenoid and probed a good ground a got a 12.6 volts. the other big lug, and the small stud didn't have any power to it, even with key on. however, when I used the ground probe on the big left stud and probed the right stud, it showed 12 volts, same with the small stud. would a faulty solenoid be getting these results?

 

ok, correct. tried that and it tried to crank, so im guessing the firewall solenoid is good and is doing its job. so im thinking i have 2 seperate problems. with the 12 volt ACC problems, maybe the brand im using is the problem. everytime i replace i use the same one and it doesnt last too long. i will run the one i bought til it craps out, but im thinking of using a different option next time. im thinking as long as its continuous duty with higher amp rating i should be ok.

now, on the cranking issue, i have been toying with my key switches and both of them lose ACC power when cranking, is this normal?

 

thats what i was thinking, but my the only way for it to start is to hold that toggle i made while cranking...which is ACC and BAT. why my ACC needs 12 volts while cranking is what i dont understand. and, if its normal and the reason why it isnt starting, shouldnt the key switch be doing this job? friend of mine suggested making the toggle on/off (instead of momentary which is what i have now), and running one to ACC and the other to IGN (instead of BAT)...that way the ACC will only get 12 volt help while im cranking...meaning i can leave the toggle ON all the time and shouldnt cause any issues, since it will only get a 12 volt source while im cranking the truck. thats my understanding anyways...

 

the Acc wire and BAT wire is what's on the toggle switch. so that toggle is feeding 12 volt to the ACC to make it turn on..why, I have no idea. so, what your saying is the small wire on firewall solenoid isn't getting power?