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Parasitic draw

626 Views 7 Replies 3 Participants Last post by  Kking79
2003 Silverado has a draw that is .75 amps to the alternator from the battery when everything is turned off. If I unplug the alternator from the harness the draw stops and it drops to zero. I also have a battery indicated on the cluster that stays on, as well as the PRNDL. Not sure if they are related but both still happen when the other is unplugged. What will cause this and should my next step be sending the cluster in for repair? Also I have already reflowed the solder on the cluster resisters.
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Why would the alternator need this power draw with the engine and truck off? Should it not be a key on hot? The alternator is brand new from manufacturer not a rebuild also with less than 2 hours of run time
Where would I look for that relay?
Right, I know it's not needed when truck is off. That is the problem. It's still calling for the alternator to be on and with an internal relay being the problem it would still happen with the 4 pin connector unplugged, but when it is the draw stops so I am trying to figure out what would be trying to turn it on with everything off.
Will do, I have already had the ignition switch disconnected and problem persited. Heading back to garage now
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