This is a Caspers "Complete 86/87 Engine Wiring Harness" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 liter turbo V6.
"Complete 86/87 Engine Wiring Harness
This engine harness is OEM design with improvements made to certain "too-short" connectors and improved engine grounds. We use only original Packard connectors and cross-linked wiring. Our harness is an exact replacement for the factory harness! With the factory harnesses approaching 35 years old, many of these Turbo Buicks have harnesses that are in desperate need of replacement.
Using the same production equipment we produce our OEM harnesses on, this harness is produced with brand new, 125*C rated automotive TXL wire. Some other modern-day improvements you'll see in this harness include better wire routing, sealed automotive spec relays, separate positive feeds through the harness, and factory fit and finish. Our engine harnesses are 100% electronically inspected before being shipped. We use specialized equipment that tests continuity point to point as well as resistance tests through the harness as an assembly. This ensures that this harness is wired correctly and will work for you out of the box!"