I'm adding an Acewell MD052 (one of their cheapest models) to a 78 CB750k Cafe bike and have run into an issue that I am hoping someone has seen before:
- After install and calibrating to wheel circumference, all was well with speedo and tach (I wired in their resistor and plugged into one of the yellow wires going to coils). However, very quickly after initial fire-up, the Acewell froze on both a speed and RPM and the gauge button was unresponsive. After this occurred, it can only be reset by fully un-plugging all connectors to kill all power to the gauge (just keying off didn't work to reset, as the gauge maintains clock power constantly through a direct battery connection). After resetting the gauge operates normally again for a minute or so, then will re-freeze.
The way I have it wired:
- Clock power = direct to battery +
-Rest of Gauge power (everything but clock) is on a keyed hot, which also is the wire that feeds power to the coils (not blue/yellow, but the power wire)
- Ground = Direct to a common ground used for other components of bike
I think the above is correct given the gauge worked initially just fine and works after being reset/unplugged, but my concern is that the way I am powering the gauge from the same wire carrying power to the coils might be incorrect? Am I overthinking it and any keyed hot wire will do or is piggybacking off the power to the coils somehow a bad idea?
