02 sportster 1200, tail light works but brake light wil not.. traced the wires from circuit board at tail light to the harness under seat. brake light pin on harness has constant power with switch on but no power at circuit board and brake light will not work
If you have power at the harness pin but not the light then your problem could be a cut wire grounding to frame between connector and light. you did not say what kind of light you have. a regular filament light check the socket as they sometimes go bad due to vibration, if it is a led light, look for a bad componet on the circuit board like a open resistor or such. if you are handy with a soldering iron, you can repair it pretty cheaply.
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Probably a bulb/ rear brake switch combination. If your front brake switch is working, then half of the bulb is working. No taillight issue, probably a bulb. No rear brake light, probably the rear brake switch. Located on the lower right rear of the frame, behind the exhaust. Check for power on the orange/white wire at switch. If you have that then check for power on the other terminal of the switch while pushing on the pedal. The rear brake switch is hydraulically operated so you must have adequate pressure to activate it.
Most of these devices use a conductive rubber "pill" that is pressed against a set of interdigitated finger traces on a circuit board beneath the keys. These can get dirty OR can have a crack in the circuit board/trace.
The latter is fatal. The dirt you disassemble and clean with a Q tip and 91 or 99% isoprophyl alcohol.
Clean both the "pill" (usuall black) and the place it presses against.
On the new bikes, the speed and signal are in one circuit, and on some the horn is in there too. This is most likely going to be the fuse or relay for this circuit. I don't know their exact location, but your local dealership should be able to tell you. If the fuse and relay are good, then you're going to have a short in the wiring, probably a bare wire or a loose/broken ground. Rare, but occasionally, a switch on the controls will hang up and cause this also. Start with the fuse and relay, then go to the wiring and switches, and let me know.
I'll assume this is on the base station portion. You can try unplugging the power while the phone is in the base, wait a minute, then plug back in. If that has no effect, I'm afraid you either have a failure in the keypad or in the electronics. To diagnose a keypad failure in the base, you'll need to disassemble the base. You'll find each of the rubbery keys momentarily connects two traces on the keypad circuit board when you press a button. You may also find the keypad fouled with dirt, liquid, etc, which could be a likely cause of failure. You can try manually shorting the two traces where the SP/Phone button would press and see if you are able to activate the speakerphone/dialtone. If that works, then carefully clean the keyboard circuit board and the rubbery keys. If that does not work, I conclude you have a bad keyboard circuit board or other electronics in the phone are bad.