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The wiring taps into the lighting so when it's running w/o the light on it recieves a charge. Therefore when the headlight is on the battery doesn't get much of a charge.
$400 FOR THE KIT PLUS EXPECT TO PAY $25-$35 FOR A BATTERY. It took me 1/2 the day to get the @$%$^#* flywheel off but after that it was only about 2hrs.