3406 b won't start

Have you tried arcing the starter...

 

Did it sit outside? Could be the Armeture is sticking on the starter

 

I have a 3406b also. I was told that the battery with the lowest amps is the one setting the bar. If your truck wasnt run for 5 months, its safe to say those batteries are toast. Just because they are charged and appear to put out amps, they are not able to handle the "load". Have them load tested at a auto parts place. Disconnect all batteries and try to jump it that way. Tap on the starter itself a few times with a hammer. May knock something loose that is jamming it from turning over. Keep us posted of your findings please. Oh yea...use The Force.

 

Hopefully it's just the starter,but might want to bar the motor over just to check.

 

There is a black relay box behind dash but your problem is starter or battery(s). That clicking noise is verifying the switch is getting juice and powering solenoid. See if anyone you know will let you borrow 2 of their batteries that's all you will need to get it started. If it still clicks have someone try to start while you tapping on solenoid and starter with a hammer. Don't bust it off the housing but give it a good smack.

 

ont hit starter

 

Jump it like this.