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Chevrolet Blazer Warning Lights and Gauges

172 messages,  Last post on Sep 18, 2009 at 1:04 AM

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#153 of 172 Re: 2001 Blazer dash lights and gauges going crazy!! [traiford] by joec121 Feb 26, 2008 (5:22 pm)
Replying to: traiford (Feb 26, 2008 5:11 pm) Sorry I can't help you on this, but wanted to add I have a 2004 Blazer and it just started doing the same thing on my way home from work today. I just dropped it off at the service center and won't have a diagnosis until tomorrow morning.   I am curious to here if anyone has any ideas on what would cause this.
#154 of 172 Re: 2001 Blazer dash lights and gauges going crazy!! [traiford] by jlflemmons Feb 26, 2008 (7:35 pm)
Replying to: traiford (Feb 26, 2008 5:11 pm) The statement that it doesn't act up with the car sitting still, but only moving, doesn't make any sense at all. The only thing that could possibly point to would be a loose electrical connection in the charging system that is getting jostled by passing wind while driving.   How many miles are on the Blazer? Replies to this message: traiford (Feb 26, 2008 9:09 pm) jlflemmons (Feb 27, 2008 5:28 am)
#155 of 172 Re: 2001 Blazer dash lights and gauges going crazy!! [jlflemmons] by traiford Feb 26, 2008 (9:09 pm)
Replying to: jlflemmons (Feb 26, 2008 7:35 pm) 58000 miles on it. If I had to describe better what the dash looks likes it has the appreance that I was turning the key off and on, keeping in mind the motor runs fine. There is also a low volume high pitched sound as the engine revs. The sound changes pitch as the rpms get higher. Maybe I got a bad replacement alternator. Could a dead battery do this? It was real difficult to jump. Replies to this message: jlflemmons (Feb 27, 2008 5:28 am)
#156 of 172 Re: 2001 Blazer dash lights and gauges going crazy!! [traiford] by jlflemmons Feb 27, 2008 (5:28 am)
Replying to: traiford (Feb 26, 2008 9:09 pm) A shorted battery could put such a load on the alternator as to cause the high pitched sound. Also a bad, or weak, alternator. Check the voltage of the battery with the engine off, then on. Should be around 12.6 off, 13.8-14.8 running. If the battery voltage is down around 10, there is a dead or shorted cell.   The gauges may be getting a low voltage to the cluster, and that will cause all sorts of problems, all of which generally correct themselves when the proper power conditions are restored.
#157 of 172 Fixed!! by traiford Feb 27, 2008 (6:48 pm)
In my 51 years I have never seen a bad battery do the things this one did. Replace the alternator AND battery. All problems gone. Thanks for your help. Replies to this message: jlflemmons (Feb 28, 2008 1:47 am)
#158 of 172 Re: Fixed!! [traiford] by jlflemmons Feb 28, 2008 (1:47 am)
Replying to: traiford (Feb 27, 2008 6:48 pm) Glad you are back up and running. Newer batteries can shed plates into the bottom of the battery causing shorts. The high current alternators we use these days will go to max output trying to charge the shorted battery and can burn themselves out doing so.   With today's more complicated systems, you really have to look close at a failure to determine if it is a cause or affect!   Jim
#159 of 172 ??Bad Alternator or just a Bad Battery by caridiot4 Jul 16, 2008 (6:41 pm)
I have a 2001 Chevy Blazer that I wasn't having any troubles with until I left the ignition on yesterday for a couple of hours. I had to jump start it. After driving it about 10 miles I turned it off again but the ignition key was left on again. After jump starting again I drove home (10 miles). This morning it started without a problem but after 9 hrs of sitting again it wouldn't start. I tried a couple of times and finally it started without a jump. However 45 minutes later it wouldn't start. 3 hours later it did. When it starts initally it seems a little slow, dash lights are kinda dim and the volt meter is around 11 or 12. However, it quickly jumps to 14 and the lights brighten and everything is normal. Is this a problem with my alternator or just a very weak battery?? Replies to this message: jlflemmons (Jul 17, 2008 5:30 am)
#161 of 172 Re: ??Bad Alternator or just a Bad Battery [caridiot4] by jlflemmons Jul 17, 2008 (5:30 am)
Replying to: caridiot4 (Jul 16, 2008 6:41 pm) See the messages above regarding battery plate shorting.   If that battery is more than 3 years old, time for a new one.

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