Never noticed them dimming at any time, but then I never noticed the C5 dimming
either. The '04 and the '98 were driven from dusk till dawn many times going
south to my son's house and I never noticed the dimming you speak of. The one
thing that I will say is that the '05 lights were what I disliked the most on
the C6 until I drove them. Can't tell you how much I like them now, best way is
to drive one and see, yes, SEE for the first time everything out there. The dim
has a definite horizontal line just above the hood that divides the light to
dark and is much easier on your eyes.
It is entirely possible that you have a bad wiring setup that allows them to
dim. One of the van conversion I drove for thirteen years on family vacations
was bad at dimming. It took about $15 and a couple hours of work in '74 to make
them bright and constant. Later when they came out I added the new halogen
without a wire upgrade. Remember that in the early '70s GM had hit the high note
on building crappy automobiles. If you want to correct the problem, add the
relays and wire them to avoid the current drop. Good place to start -
I see his kits are up to the $50 range now but once you do it you'll see how
simple and easy it can be done. His kits cut out the hassle factor completely.
The C5 kit RIK-C5 kit to properly install H4 (export) headlamps on 1997-2004 C5
I just drove US36 from Atwood KS, to Decator Il. at night with lots of rain and
if you ever needed good lights that is the place. Some of the smoothest sections
of roads in Missouri I've ever driven on, but the next county had the worst, fun
trip, and an interesting stretch of road.
Thanks for the feedback. I talked to my dealer about the dimming when
the vehicle was still in warranty and they said it was normal for a C5.
It got much better when I trashed the Delco AGM battery. No dimming
when you are driving and the alternator is doing it thing. I noticed it
more when the engine was off or at low idle. The two big current hogs
seemed to be the window motors and the brake lights. I have learned to
live with it. The cure is a $65K C6 and I am not ready for that action
at this time
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