I have an '03 GT and have had the flickering instrument lights and dimming of the headlights/domelight for some time now. I've also had my trip odo reset several dozen times and my radio would go on and off if I was sitting for a few moments at idle somewhere. My fan blower would also cycle high and low in concert with my dimming headlights.
I did put a Sun hyperground system on and it did not change a thing.
However, I see that several folks in this thread said that they had their batteries replaced and that seemed to fix it. I can vouch that it's not necessarily the new battery that fixes the problem, it's the battery connection(s)!
Last weekend, we cleaned up our GT's battery terminals (it still has the original battery) and really tightened the cables hard to the posts and it has completely fixed my flickering instrument lights and dimming headlights! I also have not had an odo reset nor has my radio gone off and on at idle since then. HURRAY!!
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JC Moore, \'03 Cranberry GT, a.k.a. \"Zippy\"
http://www.mooresmopars.com/GT-Cruiser/index-gt.html
Stage1, BTG Strut Bar, Sun Hyperground system, Prototype Power CAI, no silencers, Eibach ProKit, Borla 2.5\" SSTL single w/dual tip, APC 2G Carbon Fiber Taillights, Chrome Fuel door, \'02 foldaway heated mirrors, OEM-style rear spoiler, Progress 22mm rear sway bar, TYC backup lights, Magnecor 8.5mm, stock plugs, MB Design \"Shifter\" 17x7.5 wheels, Goodyear Eagle F1 GS-D3 235/45/ZR17 tires
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