i have a 100 amp alt powermaster now when i first hook it up the power wire was on the top side of the alt. but when i look at it, and bolt it up the power wire is at the bottom of the alt the small bolt housing on top the long bolt housing on the bottom. i could of sworn the pos wire is on top almost 98 pecent sure. the is a bolt thread hole at the top but doesnt say anything the bottom one says batt. i know i hook it up top side pos its a 100 amp one wire hook up part number 857100 the instructions say bottom but i know i had it up top.