Use creative wrapping around a brake cable or similar to get your wire up to the handlebars while supported. Note when reassembling, use glue to provide sealing from moisture, and to reinforce where the wires come out of plastic - generally these are prone to breaking here. A dab of solder and some glue were the only other parts used. My reed switch was faulty, so I replaced it with a $2.50 item from the local electronics supplier and it worked fine. I did not get a photo sadly, but the only component on the board was a through-hole reed switch and two holes for the wire to attach. In mine, there was a small black plastic version of a "guttering downpipe standoff" which clipped over two plastic studs and held a tiny circuit board in place. There may be fasteners or clips or perhaps simple friction holds it shut. Any should be repaired and then continue troubleshooting.ĭown at the sensor, if you can pop the unit open and see the reed switch then do so. If this doesn't work, examine the wire for any bumps or sharp folds or abrasions. This should go open circuit again when the magnet is removed. Move a magnet past the sensor, and this will close the internal reed switch, which will make your meter beep, or the ohmmeter read a number, probably about 1 ohm. The reading should be infinite ohms, which means no connection. You can troubleshoot the harness too - connect a continuity sensor (either a multimeter with a beeper, or an ohmmetermm or a small lightbulb and battery) to the pads on the receiver socket, the plastic holder that stays clamped to your bars. Rapid shorting of these pinheads should make the computer see wheel rotations, and give an approximate speed. (note the pictured connectors are dirty and need a clean.) If you think the head unit might be acting weird on its own, test it out of the harness using anything metallic to short the two pads on the back. I'm not sure exactly how many blips the headunit requires to calculate a speed, but from manual testing its at least 3, maybe 4. The extra pulses mean that something is blipping more than once per wheel rotation.
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