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But alternators don't last a lifetime. How can they do that???
Have no idea, I just saw the thing that they use for testing that have a gauge, rpms; no idea.I know, I just had to replace my "lifetime" World Class Alternator from Advance Auto in my Jetta. The first one lasted about 5,000 miles. The second one (which under the limited lifetime warranty is only warranted for 90 days) didn't last a day. Bought a good Bosch reman from Germany now and it works great. So... I'm not a big fan of lifetime warranties.
Jose', do you have any idea of the output versus RPM, or did you just trust the 120A spec?