TwinTurbo.NET: Nissan 300ZX forum - Voltage drops
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Subject Voltage drops
     
Posted by Hiruzaiz32 on January 19, 2026 at 6:49 PM
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Message Hey guys, my question today is should the rpms raise with electrical load? I understand that the iacv increases the rpms when the AC compressor is on but how about when it's just the headlights and AC fans? For my 1994 NA when I turn on the headlights the rpms dip down about 100-150 rpms and stays there. The volts will drop about 10-20 volts. Same with the AC fans (econ) but when turned on together my volts drop to about 12.90 volts and under. When I rev the engine the volts jump back to 13.50. I do suspect either or both my battery and alt to be bad. But.. should the rpms be raising with the load?

     
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