driver battery failing

selting

New member
Joined
Dec 9, 2018
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1
my drivers side battery is not showing a volt change when truck running(alt kicking in) . swapped batteries and same issue, batteries good. driving runs driver battery down. needing some guidance on what 2 test or look at next
 
The wire between the two would be the easiest thing to check next. Ground from that battery.
 
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