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79 XR500 and 81 Xl500 build and issues.

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I picked up a 79 xr500 and a 81 Xl500 recently.  I'm looking to make one good bike out of the two that will be street legal.  Both run good but the issue right now is the headlight.  At idle the headlight is putting out 19 volts and when revved up its putting out over 50 volts.  I know the battery is bad and could be causing the issue.  I have some 12 volt led lights I'd like to use as headlights.  Any suggestions on how to run the 12 volt headlights while still running 6 volt everything else? Kinda on a tight budget with this.  Thank you.  

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I installed the complete 12v system, including wiring harness, from a 1982xl500r on a 1980 xl500s engine. Bolted in. I was using the 1982 pro-link chassis for this build. However, if you are trying to street legal an older XR, like a 79 or 80 model, this would work awesome... Wish I still had my sweet 79 xr500. Best all around dirt bike I ever owned.

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