4-23. BLACKOUT STOPLIGHT REPLACEMENT (M689) (Cont).
Insert lamp (4) in socket assembly, push in, and turn clockwise. Test lamp by turning on BLACKOUT switch
in towing vehicle and depressing-brake pedal or signal-light lever.
Install new gasket (3) and retainer lens (2) on blackout stoplight(1)
Secure blackout stoplight (1) with bolt (6).
Connect attached wiring to wiring harness.
housing. Secure with two bolts (5).