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I have a 2002 gmc lb7 just replaced the alternator and both batterys an the gauge still reads that it is charging at 18 volts an higher anybody have any suggestions ?
 

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I have a 2002 gmc lb7 just replaced the alternator and both batterys an the gauge still reads that it is charging at 18 volts an higher anybody have any suggestions ?
I know the gauges arent always that accurate. Do you have a tuner or scan tool that will give you readings? I know mine reads off, but when I plug in either a tech 2 or my Edge CTS it give me different reading than the gauge cluster...
 

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What does a volt meter say when you touch the battery terminals with the engine running? Does the dash reading go to zero with the engine off?
 

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Test your battery connections with the engine running with a good digital voltage gauge. Report back.
 

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Moving to electrical forum
 
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