Anyone have an electrical schematic for a 6.5L diesel/99 Suburban? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**DeadheadNM** · 10-20-2021, 11:42 AM

I’m slowly unwinding all the electrical changes made to my 99 Suburban 6.5L diesel that was formerly operated by a municipal fire department.

This relay appears spliced into an engine harness bundle at one end and the passenger side battery at the other end (red wire with an in-line fuse). The truck dies if this wire is removed at the battery. At the harness end it looks like a red harness wire was cut and spliced to the blue and yellow wires from the relay.

Does anyone have an electrical schematic for a 6.5L diesel that will help me ID the cut red wire on the harness?

Snarl95 · 10-20-2021, 04:49 PM

It's for the pickups but should be the same.

https://www.dieselplace.com/threads/.../#post-7237850

**DeadheadNM** · 10-20-2021, 10:17 PM

That’s a great resource. Thank you.

10-20-2021, 11:42 AM	#1
DeadheadNM Carpe manana Join Date: Dec 2010 Location: Eau Claire, WI Posts: 12,278	Anyone have an electrical schematic for a 6.5L diesel/99 Suburban? I’m slowly unwinding all the electrical changes made to my 99 Suburban 6.5L diesel that was formerly operated by a municipal fire department. This relay appears spliced into an engine harness bundle at one end and the passenger side battery at the other end (red wire with an in-line fuse). The truck dies if this wire is removed at the battery. At the harness end it looks like a red harness wire was cut and spliced to the blue and yellow wires from the relay. Does anyone have an electrical schematic for a 6.5L diesel that will help me ID the cut red wire on the harness? Attached Images __________________ 1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 Members met: ORANGBLAZ, 2003 silverado, MikeCofield, BB72CHEVKT, Duncan&Son, Sameyrasmea72, THENEWMEXICAN, HotRod C/10, brianthelion02, Sport/Truck, ryanroo, michael bustamante, Dirt's72, Already Gone, WestButteTruck, 57taskforce, Moreyel, painterljp, AASmedic, SoCoC10, Lumaestas, carbuff382, Chevyland

10-20-2021, 04:49 PM	#2
Snarl95 Registered User Join Date: Jan 2019 Location: edenton nc Posts: 76	Re: Anyone have an electrical schematic for a 6.5L diesel/99 Suburban? It's for the pickups but should be the same. https://www.dieselplace.com/threads/.../#post-7237850 __________________ 1995 k3500 cclb srw 6.5 turbo diesel. The lessons that hurt are the lessons that teach. There is always a price to pay. You are free to make any decision you want. You are not free from the consequences.

10-20-2021, 10:17 PM	#3
DeadheadNM Carpe manana Join Date: Dec 2010 Location: Eau Claire, WI Posts: 12,278	Re: Anyone have an electrical schematic for a 6.5L diesel/99 Suburban? That’s a great resource. Thank you. __________________ 1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308 Members met: ORANGBLAZ, 2003 silverado, MikeCofield, BB72CHEVKT, Duncan&Son, Sameyrasmea72, THENEWMEXICAN, HotRod C/10, brianthelion02, Sport/Truck, ryanroo, michael bustamante, Dirt's72, Already Gone, WestButteTruck, 57taskforce, Moreyel, painterljp, AASmedic, SoCoC10, Lumaestas, carbuff382, Chevyland



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