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Are you powering anything else of the hub/Revo? When I’m running a red eye off the Revo i usually only get 2 leds until I travel at sustained 20/22kph. Setting off, around town or slower rides with the Red eye attached I’ll never get all 4 leds showing.
This is which a Shimano Alfine 6v3w hub, which should be the same output as SP8 I believe.
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The output voltage of the hub is dependent on the load. It means roughly “6 volts when 3 watts of load are attached”. With nothing attached it’s normal to see very high voltages - sometimes 3 figures!
If I were troubleshooting the next thing I’d do is try to power the light off an external/bench power supply. If you’ve got anything in the house that outputs 5 or 6 volts regulated DC try touching the wires to that.
(Not for more than a few seconds as DC can overheat components designed for AC)
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@atk
Need a collective internet sense check while troubleshooting dyno/light issues with my SP8/Exposure Revo to figure out which manufacturer to contact...
Both have been in storage for ~3 years. After digging them out, plugging everything in and getting out for an ~100km ride, I'm only getting 2 of the 4 LEDs powering up in the Revo.
I've unplugged everything and taken a multimeter to the hub. I'm getting resitance between the two contacts and 0 between the contact and axle which suggest the wiring in the hub is ok. Giving the wheel a quick spin with the MM set to '20v AC' the contacts are reading up to about 15v and then reducing as the wheel slows.
Am I right in thinking that this voltage is normal even though the hub is labelled 6v3w?
Also checked cable and voltage/resistance is the same so it's not issue with connectors.