The 2000 maxima runs well. when I turn on the heater/ac system after a while the lights dim and the car runs roughly. If I shut the car off, it needs to be jumped to start. The battery is new ( one day old). If I don't use the heater, I have no problem.
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engine running or not,,??????
or dead charging system.
rusty battery terminals.
check battery voltage parked key in pocket, see 12.65vdc.
if lower , on a warm day the battery is discharged
or at 30F it must be.12.58vdc, rested, if not the battery is discharged
or battery is bad.
if discharged , then charge it.
and fix the bad charging system.
ok you jump start car.
and the battery voltage is 13.3 to 15vdc, if not the charge system is failing, or engine RPM below 800.
if running voltage is below 13.3v the charge system is failing running.
you need to check the charging system voltage if the alternator is not putting out voltage the car is only running off the battery and the battery is not being recharged turning on the ac adds the drain from the cooing fan about 30amps and the blower motor inside the car another 20 amps and also the compressor clutch of 20 amps
That could be a bad battery. Try replacing the battery (cheaper than a new alternator). Usually, if it is the alternator, your battery will be drained and you aren't able to start the car without boosting. The dimming lights is the clue - lights run purely off the battery, not the alternator, as do most of the electric components.
HAVE BATTERY RECHARGED OR VECHICLE JUMP START.WITH VECHICLE RUNNING MAKE SURE ALTERNATOR IS CHARGING THE BATTERY.ALTERNATOR OUT PUT AT BATTERY SHOULD BE 13.5 - 14.5 VOLTS.IF NOT CHECK ALTERNATOR FUSE.CHECK ALTERNATOR + BATTERY FEED WIRE AND VOLTAGE REGULATOR WIRES MAKE SURE NONE OF WIRES LOOSE BROKEN OR DISCONNECTED.IF ALL IS GOOD AND ALTERNATOR OUT PUT LOW ALTERNATOR FAULTY.IF ALTERNATOR VOLTAGE OUT PUT OKAY. YOUR BATTERY DRAIN PROBLEM COULD BE FAULTY AC HEATER BLOWER MOTOR RELAY.CHECK INSIDE CAR WITH THE IGNITION SWITCH OFF.MAKE SURE RADIO TURN OFF.INTERIOR LIGHTS TURN OFF.HEAD LIGHTS TURN OFF.LISTEN FOR ANY NOISES LIKE BLOWER MOTOR RUNNING, OR FAULTY DOOR LOCK SOLENOID CLICKING NOISE.IF EVERY THING SO FAR OKAY.OTHER POSSIBLE CAUSES BATTERY DRAINING COULD BE FAULTY ALTERNATOR,FAULTY STARTER SOLENOID CONTACTS SHORTING OUT.THE PCM COULD DRAIN BATTERY IF FAULTY.THE NEW BATTERY COULD BE DEFECTIVE.
Your alternator may be going bad. Once the car is running, your battery has done its job and the alternator takes over. The alternator is responsible for firing the plugs, running your lights, your radio, your heater/AC, and anything else electrical, as well as keeping your battery charged. If the alternator is on its way out (or even has a less than good ground), you may experience some lights dimming, or even choppy radio signal. If the alternator is already gone, and your car is running off of the battery full time, you will also get the dimming you describe, and sooner or later the car will not even start. Take your car to an auto parts store (Advance, or Auto Zone, etc) and ask them to test your alternator. This is a free service.
It could relate to the starter being no good in general or the alternator not being good at all either. you can have both tested at local autozones or advanced auto places. More then likely it has to do with the starter. should be an easy fix if you have any expeirience with automotives. usually comes down to three bolts and a bunch of awkward angles.