I took a look at the link you provided. If you put that led in the fog light like you do a normal fog light bulb, then there should be no polarity mixup. It is designed to work just like the regular bulb.
Just to make sure it is not your fuses or some broken wiring somewhere do the test off the jump point. If it is long enough, you could touch the male spade connector from the LED to the positive jump point right behind the passenger headlight, then touch the body of the LED to some nearby bare sheetmetal. I would think the bare steel bracket that the positive jump point plastic body is attached to should work. if it doesn't light up swap where you are touching the two connections
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Last edited by sc.intrepid; 07-21-2013 at 07:46 PM.