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either the electical ignition switch has a BROKEN sliding track to move the contacts to the shut off mode or the sector gear at the rear of the key lock has stripped its gears. If the key turns easier than it use to the sector gear is at fault
You said you tightened the battery cables, did you check the other end of the negative where it bolts to the engine. When you tightened the cables you also used a battery brush and cleaned the posts and ends?
Probably a bad ignition key contact (worn out).
You can hook a pushbutton across the + to key wire terminal... the start it like an old fashened car (turn on the key and push the starter button....when the ignition contact fails to "make".
I would start by checking you switch for the tanks to make sure it is working right and if the front tanks fuel pump does not work after you check the switch I would get a 12 volt electrical test light and see if your getting power to the front fuel pump if your getting power to it I would say you have a bad pump . But some times the pump will run but the diaphragm gets weak in them.
Pull the small wire off the relay and have someone else turn the key to start position and check for voltage on that small wire, if there is no voltage present your problem may be the ignition switch mounted on the colum under the dash.
take a drill and drill out the tumblers use small bits to start off and then use large bits to finish out the job when the tumblers fall out take a small punch to knock out pin that holds the ignition in place then put in a new one be sure not to make a big hole of where the pin fits into because if you do the new switch will just fall out when you remove the key
mcdevito75, That carb, solonoid most likely works with both, electricity and vacum, That blue wire should hook up to that solonoid, look at the plug ans solonoid and see if there"s a point for the wire. If it has broken off yo"ll have to replace the solonoid. Also have the choke system on your truck checked out, if the choke is not operateing as it should this too can cause your problem. Have your local repair shop take a look.
Remove the steering column covers and you'll find the electical switch to the ignition. You'll find a rod that activates the switch from the lock and tumbler. Check for anything broken between the two.