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my voltages sit around the 13.5 range. I used a DVOM (Digital Volt Ohm Meter) and checked the voltage at the alternator with the engine idling and got 14.5 at the alt., checked the batteries and it's in the 13.5 range. That means I have a voltage drop of 1 volt between the alternator and the batteries. most likely due to corrosion where the wire connects to the battery clamps, and where the wire connects to the alternator. Sounds to me like your is most likely the same cause. you can try cleaning the ends of the cables, where it connects to the battery clamps, and where it connects to the alternator and that will 100% of the time fix it 80% of the time
05 Lariat Crew Cab, Short Bed, 142K and counting, 4x4, ARP studs, EGR Delete, IPR High Flow Coolant Filter, Dash Boss, SCT SF3 innovative tunes, Innovative FICM Tuner, Deleted CAT and Muffler, blue spring upgrade, High idle mod, Cobra 29 LXE.
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