Question about 1994 Land Rover Discovery

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The Battery seems to not be charging and The charge light gets brighter with higher rev's. I assume the alternator is shot but could it be the regulator?

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Lt could be but the regulator but these are usually built into the alternator which negates the alternator being replaced.

Posted on Aug 22, 2010

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Battery comes on and off at higher RPM


The alternator has a regulator built in to it. Alternators create an alternating current that then goes through some diodes that create the DC voltage that the car runs on, and charges the batery.
The diodes, and the regulator are built in to the alternator in nearly every new car. When the car is running at a lower RPM it sounds like they are doing there job just right. At the higher RPM's the alternator makes a higher voltage that must be regulated to about 14 volts for your accessories, and your battery to charge. It sounds to me like the regulator inside the alternator is wearing out. If you take your car to Checker, Kragen, or equivelant, they can do a test on your regulator for FREE.
The Checker by my house will only do this test while the sun is shining outside so you might want to call first.
Take your car in to them and when they are testing it rev the car up so the problem will manifest itself while on the machine.
You will probably have to change out the whole alternator, diode, regulater. (They are a package deal.)
I would get the lifetime warrenty one if you need to replace it. That doesn't mean it wont break down in the future, but it does mean you won't have to pay for a new one ever again for that car.
Presto.

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