step A: check the bulb.
step B: check at the connector with a multimeter.. (hold one lead to the wire you just ran, the other lead to something metal on your bike), what you'll see is 0vdc with brake lever
untouched, and 12vdc (off battery power) when the brake lever is pulled.. activating the pressure switch. if good, go to step D, if bad go to step C.
step C: next check the pressure switch with a resistance check putting one lead on the battery connector, the other lead on the wire that you're going to connect to the bulb. You should see a "1" reading on the multimeter when you just touch the two leads, then when you pull in the lever, you should see a noticeable drop down to something like "0.07" ish...
step D: if that's good, then check to make sure that the red/yellow are hooked up correctly.
I had the same issue, only I found out after the fact that my "low circuit" was actually hooked up to the bright circuit.. so I switched the two leads and it worked flawlessly..
Edited by rs25, March 10, 2012 - 07:11 PM.