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I has to travel at least a car length to see it but when I brake the battery jumps from half to 1/4 then back again. The alternator has been replaced in the last 3 months but this is a first. Pulled in to the driveway last night and the truck shut off completely, no power.
 

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Bad battery or ground connections? I would imagine that the battery and battery connections were checked when the alternator was replaced, but it may be worth checking them again. Ground connections would be the next thing I check. Perhaps one was not secured properly when the alternator was replaced.
 

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Sounds like alternator is not working. The truck runs on the alternator after starting the battery just completes the circuit. If the alternator isn’t working it will drain the battery completely and shut off.
 
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