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Should be on the left up on the fenderwell when you're facing the engine.


Actually I think 86 still had the early style connectors, so they'd be plugged into some little rubber holders on the right of the engine bay as you face the engine.

I want to say 88 was the first year of the rectangular diagnostics plug over by the fuse box.

My Truck: 1987 XtraCab DLX 22R 4WD 5 Speed Manual
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"Speed has never killed anyone. Suddenly becoming stationary, that's what gets you." -Jeremy Clarkson