Interchangeable 1UZ Wiring Harness

[toxicbrownboi]

I have a 1999 GS400 I need to replace a wiring harness on, I was wondering if I could use a harness off of a different year GS400 or maybe even an LS or SC?

 

[P Bateman]

If the part number is the same, then yes.
If the part number is different, you will likely need to modify it