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I usually get around 12v, it bounces a tad bit but pretty steady. But at night when I turn on the lights, get this ONLY when I go 55-70 MPH, usually the faster part of that, w/ the lights on only it goes down to 10, everything dims down like crazy like its going to die, but eventually goes back to normal.
 

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Normally you should get around 14.5 volts out of the alternator. If the problem only shows up going down the highway, the belt may be slipping.
 
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