The replacement is simple, you need a torx screw driver, remove the two screws on the outside of the black headlight retainer on the bulb, pull forward the black retainer frame forward and disengage the retainer tabs from the bucket opposite the screws and pull the bulb out. Access to the rear of the bulb and the plug is easy without breaking the plastic headlamp harness strain relief on the back side of the retangular bucket. Reverse steps to install.
Most likely you'll see the bulb socket protruding in the back of the headlight, gently grab it and turn slightly to left or right, there three tabs on the base that line up w/ 3 holes and the light assembly will slip out....don't be afraid to discuss this with the guys or gals at the autoparts house- they love to give out advice.....hope i've helped in some manner...pappy
1989 has 3 prong retangular bulbs, only the front parking light sockets rotate to remove bulbs. I own a 1989 GMC C3500 Serria XL 7.4L since 1998
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