TriassicReef Posted August 5, 2014 Report Share Posted August 5, 2014 I recently installed a 270amp alt from mechman onto a 2005 grandmarquis and have ran into some issues. Shortly after starting the car my battery light turns on, when put into gear serious voltage drop occurs and car idles roughly untill i hit the gas. While parked I checked the voltage at idle which reads about 13.7-14.0 but when i raise the rpms it only goes up by roughly .3 barely even reaches 14.1v....i understand low idle dramatically reduces output but shouldn't it read into the 14's when rpms are raised atleast?Big 3 is installed with Knukonceptz ofc 0 guage and i have checked all grounds. I can post pics of wiring or anything else to help resolve my issue if needed. This occurs with all electronics off Link to comment Share on other sites More sharing options...
WastedTalent Posted August 5, 2014 Report Share Posted August 5, 2014 probably... voltage regulator needed. battery light is key indication of pcm controlled alt. Sheena = pedobear Link to comment Share on other sites More sharing options...
TriassicReef Posted August 5, 2014 Author Report Share Posted August 5, 2014 probably... voltage regulator needed. battery light is key indication of pcm controlled alt. Can you please elaborate a little and explain how i would go about fixing it ?? Link to comment Share on other sites More sharing options...
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