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check for 12v at the headlight on the red-black wire (with the headlights in the lo position). if no volts, then check for power at the high beam select switch for 12v on the red-black wire. if no power at the headlight, but you have power at the beam select switch, the wiring went open somewhere in between. If no power at the beam select switch (red-black, headlights in lo), but your brites work, the beam select switch went bad.
 
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