SmalltownSS Posted December 6, 2012 Report Share Posted December 6, 2012 I just put the newly tuned PCM back in the truck, I have installed factory E-fans and a built transmission as well. I fired the truck up and it seems to run good, but all the interior lights and headlights are flickering seems to go with the RPM of the motor (and this is with the fans off and no other electrical really running). I have done a bit of reading about this, apparently it could be caused by the alternator or the voltage regulator. That being said is there anything anyone can think of that I could have screwed up in the fan install or with the pcm that would cause this instead? It seems kind of odd that this could just be a coincidence that the alternator decided to fail at this exact time. Stock headlights stock stereo Quote Link to comment Share on other sites More sharing options...
ThatTallCanadian Posted December 6, 2012 Report Share Posted December 6, 2012 Are you using the stock alternator or did you upgrade it? It's highly recommended to upgrade the alternator when you install e-fans on a non e-fan truck. I just woke up so I can't remember the amperage needed, but I do know that I retro-fitted efans into my 04 ss, and upgraded the alternator to a bigger one, and have no flickering issues, even with running two subwoofers. Quote Link to comment Share on other sites More sharing options...
cb2big4u Posted December 6, 2012 Report Share Posted December 6, 2012 (edited) The 145amp is the upgraded one. It came on trucks past 04 I am pretty sure. Can also get one off a suburban or something of that nature. Sent from my ADR6425LVW using Tapatalk 2 Edited December 6, 2012 by TampaVmax (see edit history) Quote Link to comment Share on other sites More sharing options...
ThatTallCanadian Posted December 6, 2012 Report Share Posted December 6, 2012 Yup that rings a bell, 145 amp is what you need. Pretty cheap to just get it from a local parts store Quote Link to comment Share on other sites More sharing options...
GI.SS Posted December 7, 2012 Report Share Posted December 7, 2012 he stated even with the efans off it still does it.... Quote Link to comment Share on other sites More sharing options...
JC03SS Posted December 7, 2012 Report Share Posted December 7, 2012 I still have stock with hid's efans and a cam and it seems to be ok so far. I will upgrade in the future. No of my lights flicker or dim at all. Quote Link to comment Share on other sites More sharing options...
The_aSSet Posted December 7, 2012 Report Share Posted December 7, 2012 Id go get the alt tested Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted December 7, 2012 Report Share Posted December 7, 2012 Sounds like a bad voltage regulator to me, time for a new alternator....... Quote Link to comment Share on other sites More sharing options...
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