Zmanj87 Posted November 18, 2015 Share Posted November 18, 2015 So about a year and half ago I upgraded my 280z alternator to a 280zx internal volt regulator alternator. I did the wire modification and everything but have this annoying issue that the alternator won't kick on unless I high rev it past 3000 RPMs. When this happen the AMP gauge needle moves from the middle to 1/4 past it. This holds for a little bit and then it drops back down to the middle. When I do this all the lights in the car become brighter as if it getting the juice it needs. Now if I do not rev it to "jump start the alternator" It will run off the battery and the car will eventually die. So I'm wondering if it's a faulty Alternator? It was a refurbished one I got from Rock Auto. Or is it maybe fuse related I have the glass fuse still and the old fuse wires in the engine bay? Thanks! Quote Link to comment Share on other sites More sharing options...
NewZed Posted November 18, 2015 Share Posted November 18, 2015 (edited) The "L" wire at the "T" plug on the back of the alternator is not getting power when the key is On. Make power go there. If the Charge Lamp blows, you'll lose that power supply. Might be a wiring problem, might just be a bad bulb. I'm not familiar with the 1975 system though. If you do find power at L then a bad alternator is likely. Edited November 18, 2015 by NewZed Quote Link to comment Share on other sites More sharing options...
dexter72 Posted November 18, 2015 Share Posted November 18, 2015 You should not have to rev the engine that high to get it to start charging. I remember it being like 1500rpm max, to get the alt in charge mode. Quote Link to comment Share on other sites More sharing options...
jeffer949 Posted November 18, 2015 Share Posted November 18, 2015 Mine had the same problem if i remember right. The reason was that the sensing wire was not telling the alt. that it needed charging. I think i had to wire a LED in parallel and that made it work correctly. Im going completely off of memory on something I did 7-8 years ago so keep that in mind. Quote Link to comment Share on other sites More sharing options...
NewZed Posted November 18, 2015 Share Posted November 18, 2015 . The reason was that the sensing wire was not telling the alt. that it needed charging. I think i had to wire a LED in parallel and that made it work correctly. Im going completely off of memory on something I did 7-8 years ago so keep that in mind. That was your L wire. Light Emitting Diode. The diode fixes a different problem. Quote Link to comment Share on other sites More sharing options...
jeffer949 Posted November 18, 2015 Share Posted November 18, 2015 That was your L wire. Light Emitting Diode. The diode fixes a different problem. Like I said.. Going off of memory that is 6-7 years old lol. But I did have the problem of having to rev it to 3k. I wonder what I did to fix that or if I ever did. Guess I will find out once i finish my motor swap. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.