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Message: <blockquote data-quote="mykeys" data-source="post: 493501" data-attributes="member: 540605">If I were to do a second alt in my car. I would start with at least one battery just for the stereo. It will make life easier than trying to tie it in with the factory alt. second  One positive one negative( on my car anyway) and a big wire upgrade get rid of the 12 AWG crap that most MFGs use and go with a minimum of 8 AWG for the typical 85 AMP alt. If your alt is bigger than that get bigger wire. Fuse it , and ground it to the body as well as the block.Mike</blockquote>

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