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Why would the voltage indicator fluctuate between 15 and 18 at all times and all lights go bright then dim and the battery light flash?


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Wiki User
2006-12-18 03:00:22
2006-12-18 03:00:22

If the answer below doesn't solve the problem, have the alternator checked, as the regulator may not be working properly. Have it checked fairly soon, as fluctuations like those you describe can harm the car's computer and electronics. Clean both battery cables good and make sure there is a good ground between the engine and body. This ground is important so make sure it is tight and clean {no paint or grease}

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If you have 2004 Chevrolet trail blazer and your battery light indicator is on, it is probably because of voltage across the battery is 12.1v.

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The charge light responds to the battery voltage. When the battery is NOT being charged, the battery voltage is a pretty good indicator of the charge state, although temperature will change the voltage a bit. When charging occurs, the voltage jumps up for several reasons. First, the charging reaction itself. Chemicals are being changed. Second, internal battery resistance. The older and the more use, the higher the resistance will be. Third, terminal resistance. There may be corrosion between the terminal and the attaching connector. The charging current goes through these resistances and raises the apparent voltage. These voltage increases fake out the indicator. The voltage under charge is higher than it should be, saying, "I'm all charged". To bypass all of this, turn the car off and measure the voltage right at the battery terminals, with no current flowing.

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A short in the turn signal wiring can cause the voltage gauge to fluctuate. A loose ground wire can also cause the gauge to fluctuate.

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Red means that the battery charge level is low or that the alternator is not charging battery properly. Check alternator, voltage regulator, connectors.

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Voltage may fluctuate due to improper wiring/groundings or sometimes due to sudden load changes. So as to give constant output voltage we need voltage regulation. If we let the voltage to fluctuate then it might cause damage to the equipments


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