when i bought my truck it had a electrical problem in the fuse box nothing really worked in the truck now thats fixed every thing works fine the other day i was charging my ac and used it for the first time and when i turned the truck off i came back about an hour later and it wouldnt run fuel pump went out would that have somthing to do with it or was it just time for it to go and happened to happen then?

 

My first guess would be fuel pump relay or its contacts where it plugs in.
Second would be the enertia (sp) switch in the passenger side footwell.

 

it was the fuse box in the cab that i had problems with but the relays were fine under the hood i did the whole wiggle test to the harnes after i fixed it and it passed with flying colors i was just wondering if the ac controls at all short out the fuel pump or the pump just went out at the time i was workin on my ac?

 

Should be totally separate.

 

You may have to take off the bed to test the fuel pimp for power if everything else checks out

 

the fuel pump was getting enough power and i fixed the ac today and gave it a run and all is fine so far.

 

which four wires do i check for voltage? with reguards to the plug to the pump. ylw/wht pinlk/blk blk and one other wire. i get 12v at yellow/hite as + and black as - looking inside pump i see pnk/black goes to pump?? cant seem to be able to get voltage on that wire. inertia swich checks out ok....pump relay has been switched.

 

^Huh?