You must have a fully charged battery during that test. If you did it sounds like you are having a problem with the ignition switch. If you do not have 12 volts at the regulator it can not pass field voltage to the alternator and the alternator can not produce electricity. You should have at least 3 wires on the alternator. 1 is large 2 are small. You should have 12 volts at both small wires when the ignition is in the run position. If you don't have 12 volts at the non green wire suspect the ignition switch or associated wiring. An absence of 12 volts at the blue wire on the regulator sends me looking at the ballast resistor and its associated wiring.
The ignition switch provides power to the ignition system thru different contacts inside the switch in run and start positions. It sounds like you are not getting voltage to the ignition system from both run and start positions. This could be the switch or the wiring.

 

well that would make sense becuase someone has replaced the starter switch inside the truck with a button. so to start it you must put the key in the run position and press the button.

 

Well fixed it. Now I feel really stupid. There was a melted wire under the dash. A friend and i found it, fixed it. now it runs better than before.

 

troubleshooting electrical problems always takes us to far off and imginative solutions, only to find an obscure wire of uncertain use happens to be slightly burnt. damn thats horrible. i know ive got one short causing me to stall maybe twice a year and i cant find it.

 

Yeah no kidding. I wish you luck with your wire. Hope you find it before it short circuits and catches something on fire. But hey maybe then you might be able to find it with the big burnt spot

 

ha. good point. let just help im not in the inside fast lane on a four lane highway like the last time it cut out

 

You got to love the electrical..lol