1996 GMC C3500 HD 7.4 J, AutomaticFACTORY OEM SERVICE PROCEDURE

Windows Only Operate From Driver's Window Switch

(SUBURBAN & CREW CAB)

Turn ignition switch to run position. connect test light between ground and affected window switch connector Dark Blue wire. If test light illuminates, replace defective window switch. If test light does not illuminate, repair open in Dark Blue wire.

Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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