The best option for your 2003 Dutchman Colorado is the LED Clearance and Side Marker Light w/ Turn and Reflector # MCL32ATB as it has the functions you are looking for while also acting as a reflector. I have attached both a review and an installation video that you can check out.
The white wire is for ground, the black wire is for running lights, and the red wire is for the turn signal. You'll need butt connectors like part # DW05744-5 or # DW05743-5 to complete the installation. view full answer...
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