Question about 1996 Land Rover Discovery

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The generator sometimes charges the battery and sometimes doesn't- had tested battery and replaced alternater generator, no luck

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If you have an actual generator, then the generator controller / relay is bad. But, with your car being 1996, this is likely an alternator with internal voltage regulator. Alternator was already replaced (that aint cheap!), so we can rule out that. For an intermittent charge condition, look for the negative grounding strap that goes to the engine block. You will probably find that it is dirty and loose. If that seems to be okay, then take a look at the power lead that comes from the alternator (big thick one) and goes to the battery. Along the length, probably closer to the battery, there is probably a fusible link that has just barely melted through. By that I mean that the link has melted in two pieces, but the 2 ends are close enough together that they can still make contact. Think of the link as a big fuse. If you don't have a link, you may have an inline fuse somewhere as well, possibly in the fuse block under the hood. A loose fuse here would cause the same condition, and a fuse can also partially melt as well.

Posted on Aug 25, 2009

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Your alternater is boarding a plane out of town. Actually it's the regulator built into the alt. Have your battery and alternator both tested. High charging voltage can burn up yor battery and lights. Here it is in a nutshell. The lower the voltage the higher the charging amps. At 15 volts the alternater is not charging the battery but simply pouring out voltage.. Have your battery load tested because it tell the alt wat to do, Have the alternater test to see if it has a comprehension problem. IFirst, make sure your batt cables are clean and tight.. Especially the negative cable.Good luck

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1998 Monte Carlo alternater not charging


Ok, i understand that you have replaced the alternator, but there seems to be a non charge state in this case. i recommend checking the charging system. use the procedure below to isolate this issue.

Wear protective eye wear and clothing and remove all jewelry when checking your battery and charging system. Jewelry is a good conductor of electricity and is not recommended. Most batteries wear out every 3 to 5 years and need to be replaced. Always replace your battery with an equal replacement battery to assure proper operation. Automotive batteries have a +positive terminal (red), - negative terminal (black). The battery in this illustration has a protective cover over the positive terminal to prevent short circuit in case of an accident. Electricity is stored in the battery and then supplied to the vehicle when the engine is not running. While the engine is running the vehicles alternator charges the battery for future use. (Note: never disconnect the battery while the engine is running. If the battery cable is disconnected from the battery a spark can be generated which can cause the battery to explode or a major electrical malfunction to occur.)

To check a battery surface voltage, remove the positive terminal protective cover. Connect the +positive side meter lead (red) to the positive side battery terminal. Connect the - negative (black) side meter lead to the negative battery terminal. With the vehicle not running and the car sitting over night the battery voltage should be between 12.5 and 12.8 volts.(You will need to use a voltmeter for this testing procedure)

The alternator is rotated by a drive belt driven by the vehicles engine while it is running. Electrical voltage and amperage are generated to recharge the battery and supply voltage to the electrical system of the car. The alternator is held in place with mounting bolts. There is a main electrical wire on the rear of the alternator that supplies voltage to a main voltage junction box. If your alternator is not charging properly, your battery will slowly drain down from operating all the electrical systems in your car and stop the car from running.(most non charge states will be the cause of a loose belt or a low tension rate, due to a mis-adjusted alternator. make sure you have enough tension in the belt for full rotation of the alt pulley)

Next, you will need to check the alternators output with the Amp meter.

Testing the amperage output of the alternator is good for measuring the amount (not the level) of voltage the alternator can produce. This test can be tricky because if the alternator is weak it can still show it as producing amperage. Which is good, but if the voltage is low, it will still allow the battery to go dead. To check the amperage output of an alternator an amp meter is needed. Once the meter is connected start the engine. Next turn on all electrical accessories and raise the engine idle to about 1200 RPM. The alternator should output the max amperage it was designed to produce. Example: a 90 amp alternator should output about 88 amps. Note: An alternator cannot sustain maximum output for long periods of time. If the alternator is forced to operate at maximum output it will overheat and fail. An alternator is designed to operate at max amperage output only for a reasonable amount of time.

((Connect the voltage meter lead the same way you would in a battery static voltage check, Start engine (do not drive) at engine idle the voltage should be between 13.6 to 14.3 volts. If not the alternator may need replacing.)))

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1 Answer

Sometimes alternater does not charge battery


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