Took to local auto zone , they said battery to low to test and said to charge and retest , then also said bad diode in altenator , could the bad low battery give the altenator a false reading i much rather replace a battery than an altenator
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Re: battery or altenator
With the engine idling, check the voltage at the battery terminals. if its between 13 and 14.6 volts the alternator is probably ok. If its below 13V you need a new alternator. above 15V same thing.
Why did u think it needed repair? is your battery not holding a charge?
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If you happen to see the IGN light come on even after the engine runs or is intermittent specially when the headlights, AC and wipers are switched on , then there is low current on the alternator or the voltage regulator charging unit.
Also if you tend to think that the battery is not charging , has a difficulty in the morning then the voltage on the alternator output must be checked as the similar fault can be also due to a faulty charging control- rectifier or regulator.
Finally if you notice any burning smell or heating on the alternator it must be removed and checked on a test bench with simulation.
No you have to change for a exchange unit ,best unit to buy is a bosch replacement a touch dearer but they are the best and last a long time ,with a diode out running to earth the battery will discharge overnight .now for the AC well the problem here is the coolong fan -- should run as soon as AC is turned which is why its cold when moving as the air flow is passing through but when stopped the heat isnt being dissapated by the front rad so the AC builds up pressure and the safety switch is turning it off .
suggest that you visit your local auto zone or advance auto to have them check your altenator and battery.the test is free of charge.sounds like you have a bad regulator in the back of your altenator or maybe your battery's going bad. thank you for choosing fixya.com!
sure!can you charge battery? if won't start charge the battery and take it to nearest autozone or advance auto parts and as long as your check engine light is on,,, they will code read for free, then they will tell you what or where problem is.if not then try this,,,put in fully charged battery,start it,,disconnect the positive cable from battery while engines running,careful not to let the positive cable come in contact with any metal of car, if engine dies,,altenator not charging,may be bad diode in back of the altenator or blown fuseable link inbetween starter and altenator.hope this helps and if so please note so in response. thank you for choosing fixya.com
the altenator will test fine although if they did not test with a voltmeter on the car reversing the voltmeters probes on the battery I would say the diode is at fault. when a diode goes bad and the battery is fully charged or new the voltage will look fine but the altenator will not charge as it should, a diode keeps the current from reversing which would be called a direct current as all cars have. if the diode is faulty the current will reverse becoming an altenating current a will not produce a charge to the battery
check the altenator with an VOLT/OHM METER
If you do not have one any auto parts store like Auto Zone sells these at a cheap price. Now that the red and black probes and place them on the battery, red ond positive Black on Negative. the meter has to be set on the DC mode. Make very sure of this so the meter doesn't not short out. With the engine running you should get a reading if 13.5r volts if the altenator is working. Now to check the diode on the working altenator. Reverse the probes while the egine is still running. If the same reading is shown the diode is bad letting the current reverse itself causing a no charge to the battery. Diodes are for letting the current to run one way which is called Direct Current. If the current is going both ways while the engine is running the battery never receives a charge.
No if the reading shows less than 13.5 volts replace the altenator no matter what for this altenator is giving a weak charge