I am having trouble wiring a generic led voltmeter from ebay to my bike I tried plugging in a light brown wire and ground and it read 0, i tried wiring it directly to the positive and negative leads of sparx capacitor and it still read 0 even when it was idling. The voltmeter works because I tried it on a battery and it read its voltage. Not sure what it can be as there is only a postive and negative post, is it the resistance? I am running PMA w/ electronic ignition & e-advancer and no battery. Let me know if there is any suggestions. Thanks!
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https://www.ebay.com/itm/12V-24V-Waterproof-Car-Motorcycle-Green-LED-Digital-Display-Voltmeter-Volt/122828098774?epid=792688988&hash=item1c99200cd6:g:eakAAOSwvApaGRi0&vxp=mtr