My right front turn signal wont work the bulb is new the fuse is good what else can i check? it is on a 2002 Ford Explorer Sport Trac, the parking light works just not the turn signal.

Question edited for clarity.
Question moved to sub category.

You also need to Google the wiring schematic for the new aftermarket unit.

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Power for the brake lights go thru the turn signal switch before getting to the light bulbs.
Do you have power in and out of the brake light switch and the turn signal switch ?

blown bulbs,, :) replace the bulbs of it was a fuse you would have a lot more lights not working, was it a bad harness none of the lights on that harness would work so the problem is the bulbs, replace the bulbs.

Sounds like you may have a bad brake light switch, or a grounded brake light bulb socket.

Check your fuses for blown and busted fuses. If so, replace them with new ones of the proper amperage.

go to the link and follow it to your owners manual, the fuse blocks and listings of what they do are there.
http://www.edmunds.com/ownership/howto/articles/120189/article.html

It should say it on the fuse box cover. Unless you dont have the fuse box cover anymore.

is the whole right side not working , i askthis because you do have a bulb burnt out some where even the side markers might be tied into your turn signal system , if all the bulbs are looking good , then replace the turn singal flasher/flashers and see if that take cares the problem

check the bulb contacts for corrosion, also check inside the bulb holder