- Jan 11, 2006
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i bought a 140 amp alternator off of ebay from a guy who makes them in his shop. he has 100% feedback and before i bought it i contacted several people who bought them from him. all of them had good things to say, so i bought one. the alt bolts in with no modifications and uses the stock wiring harnesses. it even comes with the 6 rib underdrive pulley. sweet. so i have heard that a wiring upgrade is necessary for the increased output. the alt is replacing my 75 amp stocker. i have read that i need to change a wire to a 3 gauge. which wire is it - color, etc. and how do i change it out? is it one of the wires that is in the harness and plug that fits into the alternator? if someone has done this upgrade i would appreciate any input. ( and of course the input of the generally knowledgable guru's on stangent is always welcome ) thanks.