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Q: Electrical system not charging

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New battery, alternator, battery light on dash won't come on, instrument cluster inaccurate, and four wheel drive won't engage....is battery light on dash part of incomplete circuit?

My car has 135000 miles.
My car has a manual transmission.

You may have a failing voltage regulator that could be allowing the alternator to supply too much or too little amperage to the battery resulting in the battery never maintaining a consistent charge as it is designed to. The voltage regulator is a unit that regulates the charging of the battery by the alternator. When the voltage regulator is not working properly, this may result in the alternator allowing too much power to be delivered to the battery resulting in damaging wires and prematurely sometimes destroying the battery. A common sign of this is usually the acid inside the battery boiling causing the battery to swell. You may also smell a bit of smoke due to things potentially getting too hot. In other cases it may result in the alternator not supplying enough power to the battery, resulting in undercharging the battery or not charging it at all. This may also cause the instrument cluster to malfunction as well since this receives power from the system as well. I would recommend having an expert from YourMechanic come to your location to diagnose your vehicle’s charging system.

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