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Message: <blockquote data-quote="Cadillacmak" data-source="post: 26875" data-attributes="member: 11338"><p>Start with the ground wires, pull them, clean connections and look for corrosion up the cable. Then do the same with the power cables. Check voltage at the battery, at the output on the alt. If your alt is putting out 14v and at the battery its 12v your battery could be getting weak or the cable in between is corroded. Voltage drop is caused from resistance, the more corrosion the higher resistance, the smaller the cable the higher resistance. If replacing a cable a new one, "tinned" copper had less resistance than straight copper. If you charge up your battery and everything is fine until it runs a bit, than the alt might not be able to keep up due to a problem with it. Some alts dont charge under a 1000 rpm, maybe check the part number and research that.</p></blockquote><p></p>