My brother in law has a 89 350 4X4 with a 92 or 93 7.3 L with turbo. The truck stalls after running for 5-30 minutes. If he lets it sit for a few minutes It'll start up and stall again. What I am hoping to find is a wiring diagram for the electrical system and or some ideas of what could the problem be. Thanks.

 

highly doubt it is a electrical issue. but to verify that, take a wire from batt+ to the front post on the driverside of the injection pump. now start it. if it continues to run, then yes it is electrical. if it dies, i am going to say you have a fuel issue.

 

sounds like possibly a tac. sensor too..... they like to mess with ya as well... its the big plug on the top of the IP timing cover

 

how the hell can a tach sensor make it stop running? they have NOTHING in common. my 86 doesnt have a tach, how does that one run?