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<p>[QUOTE=&quot;JDO, post: 11528868, member: 321995&quot;]New to me Volvo truck with a Cummins ISM 370 and Eaton fuller 8 speed.</p><p><br /></p><p>All the sudden gauges started going crazy </p><p>Ac clutch going in an out </p><p>Fan clutch in an out </p><p>Just crazyness </p><p><br /></p><p>I’ve checked out everything thing simple, looking for shorts etc. I’m new to working on big rigs so I’m learning (but work on my 06 Dodge common rail pretty often). </p><p><br /></p><p>Each battery shows nearly 13 volts and there only a few months old. The truck cranks fast and starts right up. </p><p><br /></p><p>But the volt gauge on the dash only is showing around 10, going up or down. Lights get dimmer, then brighter, heater fan barely will blow (not enough voltage). </p><p>Like something is drawing way to much power, or something in hindering it. </p><p>Wondering where to go from here</p><p>Thanks![/QUOTE]</p><p><br /></p>

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