Do to the fact i have been doing alot of charging system fixin lately(5 bikes in 1.5 weeks) i thought i would pass this on.
Every single bike had those 100/90 watt pia headlights installed,these things draw waay to much power for your bikes charging system.After repairing the melted wiring etc i put stock bulbs in and they all charged 13.1-14.00 ,with the other bulbs they would only charge 12.2-12.5 tops!
I had one bike it melted the whole harness up to the regulator plug!
the stock lights are like 60/55 i think.
Save your self some future money and buy a lower wattage set.the problem doesnt happen right away but over time.
Just a heads up.