06 RMK 900 via PM said:
Hey mule sorry to bother you but I am having problems getting my led light to work and you seem to know alot about them. I explained my problems on this thread. I kinda got it to work. the light gets brighter when I hit the brake, But the brake light stays on in the dash. Any idea
No problem.
The signal line to the brake light on the dash is active low. In other words, that line gets grounded to turn the brake light on. Check for a wire that's pinched to the frame/tunnel, or rubbing against some other metal part. I think this is your problem.
The brake light at the rear bumper is also active low.
If you suspect the problem's with the adapter, the first thing I'd look at is the signals before the adapter. Use a voltmeter to test this.
0) Check the ground. Set the meter to resistance (Ω), and read from brown wire to the frame/tunnel. Should get a very low reading, less than 2Ω. if this is "OL" or whatever your meter reads at open, you've got a bad ground. Don't think this is teh case because the light lights up.
1) Red lead on the meter to red wire to the taillight; black lead to brown wire. Meter should read 12-14V with the engine running. If this reads zero, problem's with the 12v line.
2) Red lead to red wire, black lead to orange wire. Should read 0V without the brake on, and should jump to 11-12 when the brake is engaged. Another way to test this is red lead to orange wire, black lead to frame/tunnel. Should read 12-13V when brake is off, and that'll drop to around 1V when brake is on. If this line doesn't change when the brake engages, that wire is the problem.
If all this tests OK, snap the adapter on. Should be pretty straight forward, red (+12), brown (GND), and orange (Brake).
Coming off that adapter, the only difference should be the polarity on the brake line relative to ground. With the black lead on the frame/tunnel and the red lead on the brake line after teh adapter, you should get 0v with the brake off and 12v-ish with the brake on.