you either have a diying battery or a ground short
A Buick with a 3.8 liter engine does not have an oil pressure switch. There is an oil pressure gauge. The gauge can be accessed by removing the dashboard panel. Unhook the wiring harness to the gauge. Reverse the process to replace the gauge.
fuel gauge on my 99 buick centry custom stays at full , then drops to empty. Is there a fuse or relay that i can have my neighbor look at it
It is in the headlight switch. If you take out your gauge bezel it's right there on top of switch..
About the only thing they have in common is the headlight switch. Have it checked out.
For dimming your gauge lighting ? In your dash , just to the right of your headlight switch
Beside your headlight switch in the dash is your gauge panel dimmer switch ( Rotate the switch all the way up to turn on the interior lights )
On a car, there is a float inside your gas tank. It is attached to a switch that sends the empty.....full signals to your fuel gauge.
I believe the light for the cargo area is turned on with the interior courtesy lights by rotating your gauge lighting dimmer wheel switch all the way UP ( The switch is located just to the right of the headlight switch )
On the left side of the front dash by the reading gauge there is a nob that looks like an oven nob, turn the nob to the left to turn the lights on. Below that is the wheel to brighten or lessen the reading gauge panel.
pull your light switch out and use a small screw driver to push clip and remove the plastic tip on the head light switch then remove the black trim around the gauge cluster
Remove the center screw below the headlight switch, and the center screw below the wiper switch. Grab hold of both switches and gently pull towards you. The plastic around the gauge cluster should unsnap from the dashboard. Unplug the headlight switch from the wire harness behind it, and remove the other 2 screws below it. Gently pull on the dimmer and outer rings. They should slide off. The switch will fall out at this point. Installation is the reverse of removal.
Just to the right of your headlight switch is a gauge lighting dimmer wheel switch , if that has been rotated all the way up it turns on your courtesy lights when the doors are closed. Also , if a door ajar light is on in your gauge cluster you probably have a sticking door ajar switch