Side Marker lights only function as signal lights when bumber park light bulbs installed

Asked by Jun 09, 2017 at 01:32 PM about the 1988 GMC Sierra 1500 C1500 Standard Cab LB

Question type: Maintenance & Repair

The side markers function with park lights when the turn signal bulb in bumper light is removed. i have 8.8v on the light blue to ground and 12v on the brown. This is happening on left and right side.  Also the green signal indicator lights are illuminated when park lights are on.

Flasher?

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