Hello everyone, this is my very first post, from a new z car owner. Well here is a wierd problem. My 1980 280zx has a newer alternator from the previous owner. I first noticed the problem when driving down the interstate with just about everything electrical on when my car stalled. I was able to get it restarted with hardly any battery charge left. Well, the car ran well when I turned everything off. Now the tricky part. The battery will run down when the car is running unless I rev the engine to about 3500 RPMs when strangely the voltage gage jumps to about 14 volts from about 12 and stays there. When this happens I can run everything without a problem. If I do not rev the engine to get this severe voltage jump the battery will eventually die and the car will stall. This voltage jump causes the lights, the windsheild wipers, basically everything to become brighter and work the way they should. I suspect the voltage regulator (which is internal right?) but the alternator is less than a year old?? Any ideas? Besides that the car runs fantastic. Thanks in advance for any help.
James
James