Well, an Ohm meter would help you determine the grounds... Might want to check out some of the electrical schematics available on line for your Elky...Try a google search, I've had good luck researching for wiring schematics, just takes a bit of time to come up with a decent wiring diagram and wade through all the bs that pops up while you're searching... There's also a couple companies on eBay that advertise complete schematics...never have bought one, not sure of their quality but you might want to consider one of them.....