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check the battery connections in trunk tightness and for corrosion on terminal ends ----also go back to mechanic and have alternator retested new dosent mean free from defects also have ignition switch (recall)checked if recall not done have it done
is the light staying on steady, or intermittantly coming on and off. if its going off and on, off and on, then the alternator is going bad, not out yet, but close i wouldnt trust it... if its steady, im not really sure what it would be... hope this helps
Couple of things to check, first this may be nothing more than a belt that has loosened or stretched after the install.There should only be about a quarter of an inch stretch in the belt between pulleys. Caution - only check with engine stopped!!! The alternator causes a strong resistance when it is producing electric power, so slippage is to be checked first. Second, if the battery light comes on and off; it maybe acting in error. Get a multi-meter and check the battery voltage with car and ignition shut off. With the meter set on 12volt bat, place the black probe on the negative side of battery or ground and the red probe on the positive side of battery. If you get a reading of 12.66 v the battery is being charged and is full. If you get 12.45 you have a 50% charged battery. If less the alternator wiring needs further checking into as there maybe issues with wiring or the alternator itself. Hope this helps.
You are right the alternator is most likely done,( regulator in the alt) This is some thing that you should take care of right away, Right now the battery is doing all of the work and it will not keep the charge up. Hope that this helps you out please let me know how you make out.
The idiot light is just warning you. A bright/normal light indicates charging system is not working at all like when engine is off or fanbelt is cut. On the otherhand, a dim idiot light indicates that the output of the charging system is below expected value, it is not enough to charge fully the battery. This could either be the regulator or the alternator. Often the regulator is replaced with an entire sub-assembly and no repairs. The alternator could either be any of the diodes (very often) or the windings (seldom). A fault on any of the aforementioned could and would cause the dim warning light.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.