pnblwzd Posted November 20, 2007 Report Share Posted November 20, 2007 Hi All It's been a while since I've posted, but I've got an issue. I installed '05 efans earlier this year with a Nelson harness, and something I noticed pretty early on is that the lights (dash and exterior) dim slightly when the fans turn on high when the AC cycles. The truck doesn't shut down or anything, but it's annoying and looks bad. It is mostly noticable when sitting at idle, at a stoplight or parked - but is also present when driving but not as much. I can't be sure, but I think it's gotten worse over the months. The alt is charging the battery, and everything else works fine. So what should I do? Bigger alternator? Install the "big 3" grounding cables, and if so where do they go exactly? Install a new battery, possibly an Optima? (The orig battery from '03 is still in there!) Install a big capacitor inline with the fans? Something else? Thanks for any input! James Quote Link to comment Share on other sites More sharing options...
chpspecial Posted November 20, 2007 Report Share Posted November 20, 2007 When I had the nelson harness my lights never dimmed. This sounds a little odd. It could be signs that either your alt or battery are about to go. Quote Link to comment Share on other sites More sharing options...
dl11sec70dodge Posted November 20, 2007 Report Share Posted November 20, 2007 time for a new battery! 4 good years and now its time to go...........you will always get a small amount of dimming when the fans come on at first just no one notices (who runs their AC at night?) unless u live in the southwest Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted November 20, 2007 Report Share Posted November 20, 2007 time to test your battery and your alternator Quote Link to comment Share on other sites More sharing options...
CoolBlueSS Posted November 21, 2007 Report Share Posted November 21, 2007 time for a new battery! 4 good years and now its time to go...........you will always get a small amount of dimming when the fans come on at first just no one notices (who runs their AC at night?) unless u live in the southwestI run mine at night. Ran mine last night. I know the 05 and newer use a higher amp alternator for the e-fans, but have not heard of anyone having to make that change. 4 years on the original battery is pretty amazing. That may be your issue. Quote Link to comment Share on other sites More sharing options...
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