Just installed my ttt's tonight and can't get the marker lights on the mirrors to work or my instrument panel back lights won't work either. Anybody have this problem before or have any idea's? Thanks Kevin

start with fuses. Where did you tap for the marker lights?

Ditto starting with the fuses.

I had a problem with one of my marker lights and found that the wire tap I used did not pierce the insulation.

What fuses would you check? I didn't tap any fuses for the lights. I tapped into a wire.

that wire you tapped is protected by a fuse....what fuse? I dunno, depends on what wire that is... Check ALL the fuses.

As always you guys were right. Checked all the fuses and the last one I pulled was the one, now everything works. Thanks

Depending on what wire you tapped into, you might continue to have the fuse problem. If you got into the wire for the backlighting on the instrument cluster, I and a few others, had some problems tapping into that wire and keeping everything working. There's another thread from much earlier in the year where I and few others went into the passenger side fuse panel area and tapped off the pin for the roof marker lights (whether you have them or not, the pin is there). This has worked a lot better and easier than the TTT instructions (we also emailed the fix to TTT). If you need the info, I can look it up or look at my truck as to how I did it.