This is a discussion on Check gauge within the General Help forums, part of the LSx Technical Help Section category; Car has been running fine. Today as I was warming up the car everything was fine too. On the way ...
12-24-2009, 12:50 PM #1
Car has been running fine. Today as I was warming up the car everything was fine too. On the way to visit my mom the check gauge light came on. All I saw was the battery gauge.
is the battery going dead? Alternator?
12-24-2009, 02:56 PM #2
As I was driving around I noticed that the needle tends to drop to the first yellow warning then back to 13. Also when I turn on the rear defrost the needle drops to where the pic above shows.
With that happening I am ASSuming it may be the alternator. Any input is appreciated.
12-24-2009, 03:20 PM #3
Probably the alt. You can have it checked at any part store free.
12-24-2009, 04:01 PM #4
First check your battery connections, ensure they are clean and tight. Then i would check the alt..
J2001 SS, Its not the car its the Driver that matters....
12-24-2009, 07:14 PM #5
12-26-2009, 10:44 PM #6
- Join Date
- Dec 2009
- Calgary, Canada
- 87 Monte SS
Take it to a garage and get it properly diagnosed. Not at a parts store. Their equipment won't pick up all the problems that a professional mechanics equipment will. As a mechanic myself, I can almost guarantee that you need to replace your alternator. But you need to get a proper test to be sure, and also to make sure your battery is okay. Bad batteries and alternators commonly ruin each other. Even a good battery that very low on charge can burn out a brand new alternator. GMs also seem to be more prone to that problem. Also your service engine soon light is on. You need to get that addressed also. That means the computer has detected a problem, and you are very likely getting worse fuel mileage than you should be.
12-27-2009, 02:41 AM #7
As stated above, remove and clean the connections as step one. How old is the battery? If it's 5 or more years old it's time to replace it. With all lights and accessories off does it climb back up to 13?
And yes - get the ses light addressed - there is no good reason to be driving with a warning light on.
12-27-2009, 04:17 AM #8
- Join Date
- Nov 2006
- 2000 WS6 6spd Hooker LT
As stated above a few times, 98% chance it's your alternator. Sounds like you have at least one open diode, causing it to barely keep up with normal electrical demands, then when you add a high current draw like your rear defroster, it can't keep up. Have you confirmed it yet? It is possible you have a shorted cell in you battery, but usually that also shows up as a slow/no crank.
12-27-2009, 10:28 AM #9
12-27-2009, 11:37 AM #10
12-28-2009, 12:56 PM #11
- Join Date
- Oct 2007
- 1998 T.A.
I just put an alternator last month and that is exactly where mine read on the gage. it would just randomly go down and I would rev it up and it would start working.
Just a tip....I took mine to a local rewinding shop and had it rebuilt for half ($75) of what AZ, AA (the chains) wanted for a reman one....
12-28-2009, 03:19 PM #12
It was the Alternator.
Tested the battery and it was good. Tomorrow I will replace the alternator.
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