I had a problem with my voltage regulator a while back. it degraded to little over 4 volts, dimming the system way down.
While your cleaning your grounds, disconnect the voltage regulator and start the sled. If the lights are brighter then you have found your problem!
NOTE: don't rev it too much (over 2300 rpm). You could over voltage the system and it could blow all of your lights.
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WAKE-UP AND SMELL THE TWO STROKE
1997 Yamaha Vmax XTC ER 600 7770 MI
1979 Yamaha Exciter 440 6231 MI
1997 Yamaha GP 1200 Triple 118.9 hrs.
1967 Mercury Cougar XR7 87,000 MI
2015 Season Mileage:0