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NFF Posted by Ari [Email] ![]() ![]() In Reply to: alternator was bench-tested <eom>, Isaac Brok, Thu, 27 Mar 2003 15:51:54 Members do not see ads below this line. - Help Keep This Site Online - Signup |
It's a term I see a lot in repair of aircraft. It means No Fault Found. That's where a part is bad on the aircraft, but works fine on the bench. They stick the part back on the aircraft, and lo and behold, it still doesn't work.
That's because bench tests are looking for a particular set of faults under a particular set of conditions. If you don't get those conditions on the bench, you don't see the problem.
So, what does that mean to you? It means that you don't drive the bench around. You said that the problem shows up after you drive the car for 5 minutes or so. Have they run the alternator for more than 5 minutes? Under the same load conditions? In the same hot engine compartment.
You could still very easily have a part inside the voltage regulator that has become temperature sensitive, and dies when the temperature goes up, or is under load for more than a few minutes. Don't assume that the bench test PROVES the alternator is good. It just proves it's good on the bench.
Does that complicate matters? Yes. But some things are complicated.
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