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The ground cable, on the battery may need to be tightened or cleaned. The alternator voltage regulator may need to be replaced.

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Q: What could cause voltage to drop when alternator is new?
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Why does the voltage drop down at idle on a 2002 Chevy Tahoe?

The voltage regulator in the alternator is probley weak. Replace the alternator


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Yes, a corroded battery can cause an intermittent voltage drop.


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An alternator's terminal voltage shouldn't drop 'sharply' when subjected to a lagging power-factor load. After all, most practical loads are inductive and it wouldn't do for an alternator's terminal voltage to drop 'sharply' for what is a normal load. Nevertheless, in common with most voltage sources, there will be a moderate drop in its terminal voltage due to the internal voltage drop caused by the load current passing through the impedance of the armature windings. Perhaps surprisingly, however, there may be an increase in terminal voltage when supplying a leading power factor, the reason for which can be demonstrated using simple phasor analysis of the alternator's induced e.m.f. and internal voltage drop -this cannot be shown here, but there are lots of websites which demonstrate this.


Why out put current increase in transformer with capacitance load?

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What would cause high voltage drop readings?

High resistance on the feeder to the load will cause voltage drop at the load end of the circuit. If this is happening, do the calculations for voltage drop, using the amperage of the load, voltage of the load, the size of the wire feeding the load and the distance from the distribution panel to the load.


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What would cause a voltage drop on a 1997 trooper when you press on the gas pedal replaced the alternator and battery but no help?

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What is the distance you can have between a 65amp hour battery and its charging unit?

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Why the alternator voltage drop suddenly and after few second later again pick up automatically during no load?

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Why does the voltage drop when you turn lights on in a 1966 dodge?

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