Blue is the aux. power, but not all trucks have it wired in, check to see if you have power at the trucks pigtail. Many trucks have the aux. wired through a switch on the dash, or a push-button breaker, for controlling features on the trailer like a tag axle, belly dump or similar. So you need to see if your truck has the switch, some Freightliners in recent years had the switch and blue wire, but did not hook power to it under the dash.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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