Good afternoon, Thanks for having me in this group. Have a shop in Eugene. Looking for a 12553327 harness or info on what it does

[Eugene Rider]

Have a 69 Chevy K3500 6.5L D.
This engine dies, if a wiggle the wiring harness, the engine will die. It's 12553327 wiring harness. Looking for one or info on it. Can't find new harness

 

[MrMarty51]

Have a 69 Chevy K3500 6.5L D.
This engine dies, if a wiggle the wiring harness, the engine will die. It's 12553327 wiring harness. Looking for one or info on it. Can't find new harness

Welcome to the forum.
If that is the engine harness that goes from the firewall forwards then go to www.quadstartuning.com and they sell new ones on their site.

 

[MrMarty51]

Engine Wiring Harness

Fits 1994-2002 6.5L N/A and Turbo Diesel engines with the side-mount turbo and the electronic DS4 injection pump. This is made to upgrade and replace the OEM harness that goes between the rear of the engine and the sensors/injection pump. This new wire harness will only mount ABOVE the intake...

quadstartuning.com

 

[MrMarty51]

Have a 69 Chevy K3500 6.5L D.
This engine dies, if a wiggle the wiring harness, the engine will die. It's 12553327 wiring harness. Looking for one or info on it. Can't find new harness

Forget what I posted except for the welcome to the forum.
Rereading Your post and Your unit is a 1969.
Best to determine which wire is broke and fix that wire.