Looking at the schematic for factory trailer package, The park lamps are supplied power through pin F, which is brown in color, Check that terminal for power with the park lights on, you could use a test light if you have one. Power on that circuit comes from the park lamp relay, through TRL PARK fuse in the underhood fuse block. With your test light, you can check that fuse, or check the fuse visually. If it looks good visually, you will need to check that there is power to(through) it.
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Tuesday, July 27th, 2010 AT 10:36 PM