hi, i'm having the same problem. the coil gets its power directed to it from thr cdi box via the white wire. the cdi box sends the voltage in pulses from the signals from the trigger coil. i've traced my problem to a defective cdi box. this is after checking all fuses, then doing the ohm test on the trigger coil but i read here its a common problem for the trigger coil mount to break. so it could test good on ohm but have a broke mount. Best way to be sure it to remove the mag cover and put an eye on it. if no problems there, move on and do the ohm test on the cdi box.