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Alternator failed and blew the headlights 2 qty. dim, 1 qty. bright. Replaced the alternator and the headlights, but the dims don't stay on when the brights are engaged.
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Sep 21, 2012 - i checked battery and alternator and they are good. ... Depends on howdim they get. Could be nothing or your alternator is failing. If your lights get ...
It sounds like a possible problem with you alternator not providing enough volts/amps to keep the lights steady. If it one light, it could be the bulb going out - buy a bulb from your local auto shop and try that. If it is both lights, you should have your alternator and battery checked at a Toyota dealer, local repair shop or if your handy with tools and don;t mind the work, pull them out yourself and take them to a local autoparts shop where they can test them for free. If either fail the test, replace them.
Yes this can be a normal condition caused by load being applied to the headlights and that lowers the voltage, the lites dim, then the load is removed and the lights brighten. Typical loads that cause this are AC climate control related. Have the Alternator load tested to confirm there is no problem in the charging system. Also have the battery tested, a battery that is starting to fail can cause this problem as well, a failing battery takes a huge amount of charging system power to keep it up, so that makes the lighting see higher spikes in voltage
The alternator is shot and is pumping out to much juice ... this has blown the bulbs and causes the relay chatter. I'm afraid it is a new alternator and bulbs :(
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.
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