[professorman]

What car is this? I am having this same issue with my 2006 Boxster base.
I am leaning towards the rear control module that is under the seat of the 987.1. I dont seem to be getting the right voltage out. I have a replacement module from Specialized ECU.

My light comes on for 1 second then goes off. It is only happening with my parking lights that have 3 bulbs. It is not happening with any other lights in the unit.

I did the following troubleshooting:
- Swap bulbs from other light
- Send direct 12v power to wire from the rear control module side and lights gets turned on

I am leaning towards something in the module going bad.