GM 1-Wire Alternator, 140 Amps, Chrome Plated At CVF Racing our alternators are specifically designed to work with pulleys at low RPM so you can be certain that your alternator will charge throughout the RPM range. A lot of high amp alternators just shift the RPM range higher to get more power at the expense of low end charging. (Kind of like a really big cam) Our alternators are tested in the USA with the highest quality components and guaranteed to get you home. We use high quality insulating materials to keep your alternator running at high amps. 1-Wire Alternator Wiring Instructions Advertised Output: 140 Amps Voltage: 12V DC Regulator: Internal Finish: Triple Chrome Plated Case: GM10SI Pulley & Alternator: Steel.