Alternator can still charge w a bad diode. But battery will drain while parkd. To test disconnect wire from back of alt..if it still drains then somethin else is runnin batt down
Andrew yes the alternator will drain your battery when alternator goes bad you running all the juice on that battery change the alternator and off you go good luck
A bad alternator no longer charges the battery, the battery will die once it is drained. This will occur more rapidly when using equipment that runs off of the battery( lights, heater blower, windshield wipers etc.) even electronic ignition will run down a battery. Your battery just went over night the alternator may have stopped working long before. Go to an auto parts store that offers free testing to make sure it is your alternator before making repairs.
Good luck.
Hi, cold will also drain your battery over night. if your alternator has not been charging your battery for a while you would run it down gradually over time. to test alternator start car, and the battery light will go off .start car and take a terminal off the battery and car should still run if it stalls then alternator is no good. another test is to start car in the dark,put the heads lights on ( point at a wall ) let car tick over then put some revs on,if alternator is ok your lights will go brighter....hope this helps
My guess is theres a short somewhere. a bad alternator will drain battery while its running because its not charging and you are running on just the battery. you might also check terminals or cables for corrosion... this may disrupt flow of electricity in or out of the battery
SOURCE: battery or alternator
I suggest you pull the battery and alternator then take them to a auto parts store for testing. Most major chain stores will do this for free. Another alternative is to get the car running with a jump or battery swap. After you get the car running remove the positve (red) battery cable. If the engine dies the alternator is not working. If the alternator is bad you will want to get your battery checked. The alternator going out could have damaged the battery so that it will not hold a full charge. Good Luck!
SOURCE: 2006 Chevrolet Trailblazer. Battery Ok.
Hallo
have the same problem with my Trailblazer, has someone a solution ?
SOURCE: 2000 chev silverado 1500 5.3 liter alternator keeps going bad
i believe there are 2 alternator's for that 5.3 i think you need the one with the higher amps. I had the same problem and went with the higher amp alternator and i have not had a problem that was 3 years ago.
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