Starting Battery

[denny lindsay]

Does the Batteries work in tandem or singlularly with 1 as a back up?

I have a 2 yr. old set (From Dealer) with a noticeable drag down during starting.

With cold weather around the corner its the last thing i want to deal with.

Denny

2005 SuperDuty

 

[snicklas]

They work in tandem. So you need both batteries to be in good shape and matched up. It is recommended to replace both batteries at the same time with like batteries.

 

[big_rooster]

both batteries same time other wise you'll kill the new one with the old one