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Discussion Starter #1
On my 03 I know there has been many many cluster issues with these things but typically the speedo or tach gets all screwed up. On mine I have 2 issues... #1 the shift indicator does not light up at all, and #2 the battery light is on very very dim even with the key out of the ignition. The alternator is charging fine at low and high rpm and the AC ripple withing range of acceptable. Anyone run into either of these issues and found out it was the cluster that went bad?
 

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Im Superrrrr!
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I'd say you have 2 issues...

The indicator is your NSBU( Neutral Safty Backup Switch) located on your tranny.

2nd issue is either your batteries or your alt....but I'm not sure what you by very dim even with the key out of the ignition....mine is pretty dim when i start it in cold weather but after the intake heater shuts off....all fine and dandy
 

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the guy that sold me truck recently changed the switch... not that that means the switch is good but who knows. I'll try one and see if it makes a difference. And the other issue, the battery light stays on alllllllll the time very very dim even with the key out of the ignition. The batterys both tested fine on my D-TAC snap on tester. They are AGM batteries so no cell test on them. I replaced the alternator because I wanted the 145 amp instead of the 105 amp and still no change. Connectors all look good. hmmmm any other thoughts?
 

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Im Superrrrr!
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the guy that sold me truck recently changed the switch... not that that means the switch is good but who knows. I'll try one and see if it makes a difference. And the other issue, the battery light stays on alllllllll the time very very dim even with the key out of the ignition. The batterys both tested fine on my D-TAC snap on tester. They are AGM batteries so no cell test on them. I replaced the alternator because I wanted the 145 amp instead of the 105 amp and still no change. Connectors all look good. hmmmm any other thoughts?
hmm any codes? maybe resetting it will fix it...kinda my last option if you have changed everything.
 

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no codes in any of the modules for anything at all. hmmmmmm???????
 

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my truck is doing the same thing. did you find a fix or what it is
 

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I also have a stock 2003 gmc with the same problems, Faint battery light all the time with ignition on or off. also I have faint to no transmission lights. However if I smack the plexiglass the trans indicator will start to glow. anyway I just replaced the batterys and the battery light still stays on (faint). any thoughts on this subject would be great. Lately I've had alot of electrical grimlins such as My stereo loosing memory, personal seat settings going haywire, then last night my stereo had no sound, I thought the fuse to the amp went out but it worked great today???????? Is there a ground I need to look at or a possible loose connection??? or is the ECU going out???? thanks
 

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Did you guys ever figure out what the really dim battery light was all about? Mine just started this tonight.
 

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I think it's a problem within the cluster, had the same problems for months and when I replaced the cluster I haven't had a problem with either.
 

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Thanks... I've been tryingto read old threads about it. Seems like they all point to the instrument cluster. I think the previous owner had the instument cluster replaced already so I thought it should be good... but I guess this one is going bad too. Thanks for your help.
 

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I had a problem with the cluster, but I also had a problem with the glow plug module. My glow plug module died 2 months ago and I sold the truck so I never figured out what was the cause of the glow. I was told that if the module went bad then it could keep a ongoing current to one ore more plugs causing a faint glow on the cluster. Just something to think about.
 
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