Question about 1996 Land Rover Discovery
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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Posted on Jan 02, 2017
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You can test this by putting a volt meter across the battery posts. A fully charged battery should read 12.6 volts. Then start the engine and the voltage should increase to 13.5 to 15 volts. If you do not get this increase in voltage, then the alternator is not charging, which can be either the wiring to the alternator or the alternator itself being bad. Good luck :O)
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