OK, so I just got a 3 amp lighting coil and lighting coil flywheel for my HS40. There are two yellow wires which I understand from the manual, are AC 12v and a green wire which is the engine kill switch. I have a 12V DC headlight and I have heard that if I ground one of the yellow wires and run the other yellow wire to the headlight as the positive, that the headlight will work, but will dim with engine RPM's. Is there any downside to this such as blown bulbs, shock or spark hazard from grounding one AC leg? I have heard that if I use a rectifier, I probably need to use it to charge a battery and make the system more complicated. If I did this, is there a problem using a small 12V DC Nicad type battery, or would a 3 amp lighting coil potentially overcharge it and cause a possible fire?