Battery tender on both batteries?

[mschuyler]

Duramax has two batteries. I don't use my 2007 very much so I'd like to put a CTEK battery tender on for this winter. Will putting one on ONE battery flow through to the second battery, or do I need two tenders, one on each? TIA

[sdeeter19555]

Duramax has two batteries. I don't use my 2007 very much so I'd like to put a CTEK battery tender on for this winter. Will putting one on ONE battery flow through to the second battery, or do I need two tenders, one on each? TIA

Should only need one as the batteries should be in parallel from what I remember. Should be able to trace the cables from on to the other easy enough....

 

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