What is your question?
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What is your question?
Hi I have a Mercury sable 2002. When I turn the A/C On, RPM fall down and the battery lights turns on. especially at night when the head lights are on. sometimes the engine becomes off. Thanks
2 Replies
have the battery checked and the alternator.one of them is bad or both.you must have a full charge on the battery before alternator can be checked while on vehicle,unless you remove it and take to autozone,or advance.if you do this way, stand near testing machine display and watch to make sure of results.have them test it at least 3 times. it sounds like the alternator is bad if car is cutting off,but if battery is bad,it will not stay maintained by alternator.the battery is for starting the car,then alternator takes care of running all electrical including computer,pcm,ecm ,etc.check the sides of the battery,there should be a round sticker on it with the year it was bought.average battery life now is 4 years,date could be on top of battery.heat is what kills a battery.its probably got a group 36R BATTERY IN IT.
It could be the Battery not holding charge well.. but I'm leaning more towards the alternator because there was no mention about battery light coming on for any other reason..even with the weak battery the alternator should provide sufficient power to keep the battery light from coming on during a/c operation. have the alternator checked along with the battery
well,that was last year 2014 Christmas Day!hope they got it fixed by now!!
I bought this car recently. Last owner told me that the alternator and the battery were new. It seems those are new but I do not know about the quality.
i would still get both of them checked.because i have seen a new,or remanufactured,alternator go bad after 1 week to 1 year.thats why parts houses give you a lifetime warranty,they know it will go bad,because they have 12 year old kids in mexico,or singapore,or tiawan,or china rebuilding or building these,and they only replace the parts that are bad,in the remans.