Question about Chevrolet 1500

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Dash guage registers all the way to the right now when engine is running...voltage guage problem or voltage regulator not working? Have 188,000 miles . never repalce alterntor..runs good, just guage shows high voltage..

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Check the voltage with the engine running. If it is 14.5 to 12 it's the guage. 14.5 and above it's the regulator.

Posted on Nov 10, 2010

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It sounds like the voltage regulator for the insturment cluster is malfunctioning -- that's why you got the recommendation to replace the instrument cluster.

If it were just the temp guage failing, the problem could be a faulty temp sending unit in the engine block. However, with more than one guage failing, it sounds more like an insturment-voltage- regulator problem.

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the voltage regulator is in the computer,check you battery with volt meter with engine off it should say 12volts then check it again with engine running and it should say 14-15 volts. if not the you will have to take it to a dealer to check the computer,hope this will help you!!!

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Sounds like all of the high drain devices are disabled due to a weak battery. You are still getting dash lights and radio because they are very low drain devices. Try charging the battery to test for now. It could be a failing battery, or your alternator and or voltage regulator could be going out and not charging the system. But first, try to charge the battery, and see if you can start it, if you can, let it run for at least 10 minutes. If your alternator/VR is going out or is already out, you should have a guage, or idiot light telling you that you have low voltage. If its a light, you should see a red battery lit up on the dash, if its a guage, it should be directly in the middle +/- a little. If you are able to run the vehicle for a while with no light coming on, or guage showing low voltage, its safe to say you drained the battery, or it is failing. If its a few years old or more, i'd go ahead and replace it. Hope this helps :)

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Check the alternator at the battery terminal with a voltage guage and engine running. At the battery terminal with engine OFF voltage should be at least 12volts with engine running it should be at least 14volts. If it Not 14 volts with engine running then the alternator is UNDER charging and will trigger the light on the dash. Good luck and thanks for using FIX YA.

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Have your alternator output checked; the voltage regulator might be failing.
You can check it easily across the battery terminals.
You shouldn't have any more than ~ 14.3 volts at any revs., and about 12.6 with the engine off.

If it checks out OK, the next step would be to access any plugs to the instrument panel, pull the connectors apart and then replug them.
You may have a flaky ground under the dash too.

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