Intermittent blackout on instrument cluster - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 3 (permalink) Old 04-07-2020, 10:14 PM Thread Starter
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Intermittent blackout on instrument cluster

Sorry if this has been addressed, but my searches didn't pull up a similar problem. I let the sun go down on me recently and discovered a small electrical problem: the speedo and tach and running lights would cut off leaving me riding blind and unsafely not visible! Here's the weird part, the hazard lights, turn signals, and foot brake still worked! And after several miles the running lights and instrument cluster would come back on for a few miles, then cut off again. I was about 50 miles from home, so when the running lights cut out, I would activate the hazards until the running lights came back on. I want to resolve this for night travel and just over all safety. If anyone could point me in the right direction to a similar post, or just offer insight into the remedy, I would greatly appreciate it.
2003 VN750 A19 for reference.
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post #2 of 3 (permalink) Old 04-08-2020, 03:35 AM
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Heya,

I'd guess that you have a loose wire or corroded connector. The power for the running lights bounces around the bike quite a bit. It goes from the R/R to the ignition, back to the junction box, then to the lights. The ignition puck has been known to go bad over time due to weak springs, but I think it is best to check other possibilities before opening that up.

Power must be getting to the ignition puck on that first leg of it's journey, or your engine would cut out as if you'd hit the kill switch. (white wire at ignition)
If your headlight cut out, then you're losing contact in the puck or in the wire back to the junction box, or the headlight fuse. (brown/white wire at ignition & junction box).
If your headlight stayed on, you must still be getting power back to the junction box from the ignition switch.
If it stayed on, then the break is likely in the wire between the junction box and the lights. (red/blue at junction box)

Check the wiring diagram in my signature for details.

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Wiring Diagram + annotations * still undergoing revisions, but still more useful than the generic one. Let me know if you find mistakes or think something additional should be added
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post #3 of 3 (permalink) Old 04-08-2020, 08:36 AM
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The electric connections for all those is in the headlight bucket. Check the connections as mentioned and also look for bared wires touching the shell, although plastic the chrome finish makes it conducive.

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