you can go in on any yellow wire for hot,brown for ground. If you pick up the yellow right at the voltage regulator it will work best.resist the urge to "cheat" and ground to the chassis somewhere,use a brown wire and things will work right.also,DO NOT use the scotchlok connectors,splice and solder everything so corrosion and vibration wont be an issue.
The problem with grounding to the chassis is that the electrical system on a poo is NOT directly bonded to the chassis.That is why everything wired at the factory is grounded with a brown wire,which grounds directly to the stator. The only ground connection to the chassis is INDIRECT,thru things like the pipes.The motor (and the electrical system that it alone creates) is insulated from the chassis by the motormounts.If you measure the resistance between a brown wire and the tunnel with only a milivolt load, it will show zero,but if you were increase the voltage to 14,and the current to , say 1 amp,you will find the resistance will be rather high,thus if you connect a load (shield or whatever) in this manner, the current required to run it will be higher,and will lower the available current and voltage from the lighting coil proportanatly.
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