1 An interesting K75 Electrical Gremlin Wed Jan 06, 2021 5:18 am
jjefferies
Life time member
(K75) I've had a minor electrical fault with my headlight. It would intermittently turn off. A touch of the thumb to the switch or flashing it would correct the problem. Then this past week I noticed that they (high and low beams) were both off. Checked the bulb, it is fine. Flashing the high beam would still work. So I took the switch apart, an hour's work, cleaned off the contacts with 1500 grit paper, applied electrical lube spray, reassembled. Problem persisted. Called my bud, Greg, and he would sell me a used switch for USD$40. Ok, went over got it. 1st issue the connector was the wrong one. The connector on my K75 is a 3x3 grid. The one Greg had was 2x7. Ok back over and find a different left switch with proper connector. Bring it home and before tearing everything apart and installing it, connected it up and tested it. Same problem!! OK back to the schematics and what is going on? Can I have come across two switches with the same failure mode or is it something else? Just so you an identify the problem the headlight switch connector is under the tank on the left side and is housed in a somewhat soft plastic cylinder closed at the front and open at the rear. Also in the connector are the left turn signal and the horn switch leads. If you have a K75 then you will have undoubtedly noticed this connector as it is relatively large and different.
Three possibilities: is the problem in one side or the other of the connector, or in the switch? Description of circuitry. There are three wires involved, a power source, and a wire to each the low beam and the High beam. So elimination of possibilities, I found the power line on the harness side of the connector (green with Blue stripe) and the low beam (yellow) and the high beam(white). With bike power turned on Connecting the power line on the harness side in turn to the high and low beam produced light, i.e. the headlight lit up. Looking at the switch side with my Fluke 75 multi-meter I could not get continuity between the pwr(green w blue stripe) and either the low beam(yellow) or high beam(white) connectors with the headlight switch set in either low or high beam. I did get continuity between the power(green with blue strip) and the high beam (white) if I pressed the switch as you would when flashing the high beam.
So at this point it would "appear" that two switches have failed in a similar if not the same manner. Has anyone else ever run into this particular failure mode and what was your resolution?
Three possibilities: is the problem in one side or the other of the connector, or in the switch? Description of circuitry. There are three wires involved, a power source, and a wire to each the low beam and the High beam. So elimination of possibilities, I found the power line on the harness side of the connector (green with Blue stripe) and the low beam (yellow) and the high beam(white). With bike power turned on Connecting the power line on the harness side in turn to the high and low beam produced light, i.e. the headlight lit up. Looking at the switch side with my Fluke 75 multi-meter I could not get continuity between the pwr(green w blue stripe) and either the low beam(yellow) or high beam(white) connectors with the headlight switch set in either low or high beam. I did get continuity between the power(green with blue strip) and the high beam (white) if I pressed the switch as you would when flashing the high beam.
So at this point it would "appear" that two switches have failed in a similar if not the same manner. Has anyone else ever run into this particular failure mode and what was your resolution?