Cut the tire? Can they be pulled off the switches terminals on back. Or pull the wires gently to see if they a connected somehow further down?
Watt meter inline? Something like this:
RGBZONE 130 Amps Power Analyzer, High Precision RC with Digital LCD Screen for RC, Battery, Solar, Wind Power
https://www.amazon.com/dp/B01LAUKXOQ..._v7upCbVCMWKTH
This is getting to be a good mental challenge.