86 6.9 dies- wiring issue?

[Glamis0831]

Hey Guys,

Can’t figure this one out. This is my first post so I apologize if it’s in the wrong spot.

My 86 6.9 will start up and die a few seconds or minutes later. Doesn’t run for any specific length of time. Fires right back up without glow plugs or cranking so I think this eliminates the traditional air in lines issue we all know and love. All wiring connections on top of the IP are tight and making contact- new IP 15k miles ago. Motor was swapped 2 years ago by a good shop and has 80k miles on it.
Any help is appreciated. Thanks guys

 

[Thewespaul]

I would use a multimeter and confirm you are still getting power at the fss when it dies

 

[Glamis0831]

Thanks! I’ll try that tomorrow. If I still have power where would you go from there?

 

[Thewespaul]

Well that’s the only wire you need to run the engine, so it would eliminate a wiring issue

 

[Glamis0831]

Thanks I really appreciate the help. I’ll report back!

 

[icanfixall]

Welcome to the forum. Can you tell us what the fuel level is in the tanks? If its near 1/4 tank you probably are running out of fuel. These tank suction heads break off and the last 1/4 tank of fuel can't be sucked out. cheapest easy fix is never allow level in tanks to get to 1/4 level.

 

[Glamis0831]

Well that’s the only wire you need to run the engine, so it would eliminate a wiring issue

Had power to that wire. It was the ignition switch cutting off engine power. Replaced it at the end of the steering column and good as new.

 

[Thewespaul]

Sweet! Glad you got it squared away