85 CMX 250C, 82 GW Remember that you are invisible, treat all others accordingly. Avoids Road RAGE!
1st, I'd take a hair drier or carefully use a heat gun to the wires. Then, spray 'wire dry' onto them. This should temporarily stop the short, if this is indeed the cause. Although this isn't actually testing the wire, it provides a fast test that proved the fault on mine in quite short (pun intended) order.