Engine Harness Bulkhead Map

[gofast321]

Hi All.

I'm working on a Gen V LT swap into my 1988 Suburban. It is a truck that I bought from a previous owner who had already started the swap before losing interest. It has been a challenge trying to complete some of the items that were half finished when I purchased it.

Anyway the previous owner had pulled all of the engine harness wires out of the bulkhead plug and I'm having trouble finding an accurate pinout map of the bulkhead. I only need a few wires for the swap...

• 12v+
• Crank
• HVAC power
• Fuel pump
• etc.

Does anyone have an accurate pinout map of the engine harness bulkhead?

Attached are a pic of my current bulkhead plug and a schematic for the 88. However, the schematic I found for the 88 doesn't seem to match. For instance it shows three pins across on the first and second row but my plug has 4.

Thanks for the help.