I had a simular problem with mine not so long ago, but I also had the Bat light coming on, but only at idle & only very faintly. But it seamed to still be charging the Bat. I was lucky enough to find a brand new never been used Nissan Alternator, for a fraction of its new & cost to revcon old, which when I put it on solved the problem.
Also check your earths. My fuel gadge was playing up at one point, turned out to be a bad earth on the fuel level sensor, which is earthed to the top of the Fuel pump.
Daz
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