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Seems I'm constantly fighting to keep enough battery in my truck. The 12 Valve and killer stereo system and pulling trailers...so I'd like to add a second battery...any aftermarket kits to do this, or will I have to fab it up myself??

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Are you running a group 31 battery? The interstate part would be 31P-MHD which is a 950CCA. You might actually be able to go down some in CCA to help increase service life since you live in AZ, an Interstate part for that would be a 31P-LHD 750CCA. I work for interstate in case you couldn't tell, but those part numbers should be easily crossed by anyone.

I had a 92 for awhile that had a 6 year old battery in it and it started fine even in single digit temps. It lacked the killer stereo though.

With as easy as those rotary pump motors start you could probably just hang a hand crank out the front that you could kick before you get in . My friends and I joked that you could start my old 92 beater by hitting the alternator pulley with a hammer lol.