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Wiring gone crazy

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Ok so i had a stereo installed on my 57 mack b65 everything was ok then i had a battery go out and i had one of my workers replace them so the truck started but the stereo stoped working we checked all the wires and everything seemed to be in place but the lights were also dim the amp gauge was peged and fuel gauge was peged i thought maby a body ground so i attempted to install a ground between the negitive post and chassie and it sparked so bad its not funny so we were thinking the battery was installed backward so we changed it now the lights were nice and bright but no start we turned the other battery around and it sparked like hell  i need a wiring diagram to understand how it transforms from 12 volt to 24 volt start  thanks any help is appreciated 

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