Question about 2004 Chevrolet Suburban

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Lights flickering volts drop already replaced alt and battery help

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  • Chevrolet Master
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Check for a short.

Please see my tip at http://www.fixya.com/cars/r5925550-dead_battery_troubleshooting . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

Posted on Oct 12, 2010

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Posted on Jan 02, 2017

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computer does not control headlamps.could be loose ground or daytime running light module.turn lights on with switch does it still flicker? or are you talking about batt light check plug for tight fit on alt.

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Battery wont charge, battery/ABS/SRS/BRAKE lights come on while driving and flicker. voltage increases to dash lights/fan speed/headlights periodically.


Get a volt meter, start your car and see how many volts your car is producing while running. Should be around 14 volts. May want to watch the meter for a while since your electric seems to fluctuate. Most voltage regulators are internal of your alternator. If you are getting a lot more or less than 14 volts while running, replace the alternator. If it is not charging, voltage will drop as vehicle runs, until battery is dead.

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I HAVE 2007 YARIS AND ITS BATTERRY LIGHTS FLICKER ONCE A WHILE, MAYBE FEW TIMES EVERY 5 MINS AND MY HEADLIGHTS WILL DIMMER AND BRIGHTEN UP


first step remove your battery and clean any corrosion off if present (if you haven't already) and then re-install and make sure you got a good connection. if that doesn't work you should have your battery and alternator checked. FYI if you remove a battery cable and the car dies it's your alt.(also the alt creates a magnet if it's working properly). if battery and alt are working fine you probably have a short somewhere. harder to find with out the proper tools.

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youre alt is internaly regulated so with it being new and youre battery is new follow youre wiers from youre alt to youre firewall making sure you dont have any bare wiers cuasing the system to have a week short and make sure all of youre conections from youre battery to youre starter and the alternator are cleane!

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I have a 1990 dodge w150 4x4. put new alt & battery in it. still not charging wright. pull positive cable and motor dies. already went through 4 alt. could it be the black box that connects at the alt.


you need to check your electrical system with a digital volt meter-when the vehicle sits overnight, the battery should read about 12.5 volts before startup. You should get the same (or very close) reading at the large post on the rear of the alternator, then start it up. Readings should go to close to 15 volts, and gradually drop down to close to 14 volts at idle, again at the battery and the rear of the alternator. If it is much less than 14 (like 13) or more than 15 (like 16) you have a problem either with the voltage regulator or the ecm.

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The battery kept dying. Buying a new one did not work. Now it will not start after being charged then turned off. Could it be the alternater? Another question, can I put one in my self?


Yes, sounds like alternater.Most cars run off battery and the alternater replaces the voltage your using.If alternater is not putting out the car will kill battery very quickly.If you have some basic tools you can change this out yourself.If you have a digital voltmeter to verify the alt is putting out you can charge battery read battery cold,start car and read battery voltage with car running should be between 13.2 to 14.5 volts DC.If battery is reading 12 volts and dropping rapidly,your alt is shot.

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My battery light is flickering on my 1998 ford Taurus. The alternator is only two years old but the battery is close to six or seven years old. But, it still starts up in negative degree temperatures. The...


Probably the alternator again. If you have a voltmeter or there is one in the car, check battery voltage with car running. It should be at least 14 volts. Not 14 volts or no voltmeter--take alternator off and have tested at parts chain. Let me know if you need instructions or have more questions, and thanks for using FixYa.

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