I started the engine, and it is a fast idle, 1000 RPM. I have tried to keep my explanation simple, but. I’ve had this posted on a Mitsubishi Eclipse forum for two weeks, with no reply. For example the computer gadget that senses whether the AC is on or not thinks it is always on, even when it isn’t.įirst of all, thanks. So if the above voltage measurements don’t show any problem, something may be wrong with all that too. Instead the computer will wait until you have started back up and driving down the road, then the radiator fans turn off, then it will allow the alternator charging to kick on and charge the battery. For example if you are waiting for a stop light and the radiator fans are on and the AC is on, even tho the battery may need some charging the computer won’t allow the alternator to kick on, b/c the extra load on the engine would cause the engine to stall. But with newer cars and all the electrical gizmos they have, it requires computer-think. In days of yore the alternator figured it out by itself. What does that measure?Īs Tester posts above, on many newer vehicles – presumably yours included – the alternator charging scheme is figured out by the engine computer. What are those measurements? Next measure the voltage drop between the B post on the alternator and the Battery + post. Those measurement should be the same or nearly the same. Then over at the alternator, measure the voltage between the B connector (the big thick wire that runs directly to the battery +) ,and the alternator case. Probe right in the center of each post, not on the connector. With a volt meter, measure between the two battery posts. Next, again at idle, make sure you measure the same voltage at the battery as at the alternator. When the engine is idling make sure the alternator is spinning and that the alternator drive belt isn’t loose and slopping and slipping around on the pulley.
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