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Daves71, ASE Certified Technician
Category: Chevy
Satisfied Customers: 719
Experience:  35+years experience in automotive repair
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06 duramax, 37000 miles, dead batteries, charge- dead again

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06 duramax, 37000 miles, dead batteries, charge- dead again with in two hours, all relays check open with relay coils good ohms.
Is the alternator ok? Have you load tested the batteries to see if they are good?With a dual battery set up if you have one battery that has an internal short it will kill both batteries.Each battery must be tested by itself with no connections.Let me know and we can go from there ,thanks,Dave
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