Could be a bad relay
SOURCE: 1995 Suburban Electrical: Battery is being drained.
The alternator is usually the culprit when nothing else has been modified. However yo mentioned changing it. (actually the regulator inside the alternator usually fails and drains the bat when the engine is off) However there is a very common issue with mid 90's gm trucks, the brake switched go bad and cause the brake lights to stay on. Try lightly touching the brake pedal and see the lights go off after slowly releasing it. the fix is a new switch that fairly easy to replace . These are mounted on the brake pedal arm just above your foot.
Aside from these two issues, you will need to trace the problem to its source by taking items out of service one at a time by removing fuses. not that the engine computer and the radio will always draw power at start up and a tiny clock current thereafter. But there should not be anything else. The voltage guage is not very accurate in the dash. Use a volt meter to watch voltages unplug fuses until the voltage goes up. without the vehicle running, voltage should be between 11 and 12 volts on a charged battery.
And finally, check the grounding. There should be a ground strap between the engine and vehical body in addition to the battery cable. If this is broken or missing it will cause errant readings of voltage in the dash.
I hope at least one of these tips works out for you.
-FW
SOURCE: Replacing the light on the steering wheel buttons?
The switch has to be replaced, the bulbs are not serviced seperately. On some of the vehicles, you could pull the the switch out far enough to access the connector and change it from the front, but be careful, if there is not enough slack in the harness, the steering wheel has to come off, along with the rear cover on the wheel, to get enough slack in the harness to remove the switches. This was a design change around 2004 or 2005.
SOURCE: have a 2001 gmc jimmy...drove home gas gauge read
chevy and gmc trucks have an on going problem with this,turn the key on,and get a rubber mallot or a hammer and hit the bottom of the fuel tank a couple of times,this will unstick something in the fuel pump/sending unit.
SOURCE: I have a 2005 Envoy, the fuel gauge does not work
Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Silverado instrument cluster repair
Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Envoy instrument cluster repair
All 1992 Chevrolet vehicles are equipped with electronic speedometers. If you have to fix the speedometer, you must pull out the gauge cluster, reach behind it and rewire the speedometer. You can save money by performing the task in your garage or driveway and the entire process should take less than 30 minutes.
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Park the Chevy and turn off the engine.
Remove the two screws from the dash above the steering wheel with a Phillips screwdriver. Pull off the dashboard. Lower the steering wheel as far down as it will go.
Remove the screws from the gauge cluster; there is one screw in each corner and they can be loosened with a Phillips screwdriver.
Pull the gauge cluster toward you and reach behind it. Connect both of the wiring connectors at the rear of the cluster to the gauge cluster itself. The left wiring connector is for the speedometer.
Reinstall the gauge cluster and its screws. Reattach the dashboard above the steering wheel and secure its screws.
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