LED Load Equalizer Challenge…Can u answer this question?

[ExploKnowledge]

Does anyone out there know the answer to this Explorer Electrical question?

When looking at the rear tail light electrical harness, There are 3 wires that connect to the plug adapter to fit into your main tail light (not the reverse light). I believe one of them is Blue with a white strip going down it, one is Black, and one is a redish grey. WHAT ARE THEY? Which is the ground, or the positive? I am installing LED load equalizers and I need to tape into the right wires but there are 3 and all my other friends car only have two. I CANT MESS THIS UP? Does anyone know for sure?

 

[Nocturnall]

I dunno which is which but a haynes manual would have an electrical schematic. Also harbor freight has multimeter's for $20, those would help you for this and every other time you needed to know what a wire was current wise.

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=37772