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Do you own a professional type scan tool ? Would need to see if the instrument cluster can communicate with scan tool . That would be a priority . If the instrument cluster ,for some reason wouldn't be talking,checking power an ground for the cluster . Batteries going dead , changing batteries without a alternative power supply can cause modules to go to sleep permanently ! Battery Disconnect or Replacement Problems I'am not saying that's what happen to your's . 2003 to 2006 GM had cluster problems ! The solder use in the cluster caused silver migration , instrument cluster caused a drain on the battery overnight . Watch these videos !
You need to disconnect the battery negative lead and place an ammeter between battery and lead, note the current draw with every thing switched off, then start removing one fuse at a time from fuse box and see if ammeter drops significantly if not refit fuse and remove the next one and repeat this until you find the one that causes a significant drop, then you will have found the circuit that is draining the battery, you need to check this circuit to find cause of power draw and repair as required, let me know how you get on
I have less than fond memories of tracing electrical troubles in a Jaguar (though much older than yours). Here's the basic process you need to follow:
1. Pull all the fuses. Does the battery drain overnight?
If yes, then a circuit that is not fuse protected is the problem. Start with starter/solenoid, etc. Disconnect each thing and test with meter.
2. If battery drain stops, then use meter to check current drain on each fuse. One will have more than a trickle.
3. Once you find which system is draining, you can narrow it down further by disconnecting each thing on that circuit.
Yeah, It's a pain, and may take days, but you can find it.
Batteries have a service life of 2-5 years. It seems like your battery is in need of replacement. Have it tested, or if it is more than 3 years old, just get a new one.
Check for any of the interior lights especially the glove box staying on, or one of the door switches stuck in the on position.. Other option is to pull all the fuses, then replace them one at a time overnight and monitor the battery. Soon as the battery gets drained you've found the circuit causing the problem, then troubleshoot that circuit.
A battery that runs down overnight usually means a bad battery cell...you can sometimes see a swelling of the battery case as the cells are aging...if battery is new...a rare starter short can cause the battery to drain overnight...When running, have the battery tested before you are stranded...Hope this helps.
if you take lead off battery touch to positive pole with everthing switced off should not get a spark as they touch .if you do then something drawing power have to find it could be an old system in car like phone or alarm causing it
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