Need to know what year, engine size and if it has a carburetor or throttle body injection (TBI).
Are you sure you didn't turn the dimmer down
turn signal arm
Does it turn over? Compression, Fuel, Spark?
Probable causeFlasherFusecontrol lever
To idle down your 1984 Chevy Caprice, start by allowing the engine to warm up to operating temperature. Then, locate the idle adjustment screw on the carburetor, which is typically found on the side of the carburetor body. Turn the screw counterclockwise to lower the idle speed, monitoring the RPMs on the tachometer until you reach your desired idle level. Finally, ensure the engine runs smoothly and make any necessary fine adjustments.
Maybe a bad switch
one of the lights is not working
If the windshield wipers won't turn off on a 2000 Chevy Blazer, check the wiper relay switch. This is usually located in the engine compartment fuse box on top of the battery.
Idle speed is computer controlled and is not adjustable.
Hyundai accent idle speed
how to turn the idle down. See if it's carburetor or efi. There is a speed adjustment for either using the idle speed screw (carb) or air bypass adjustment screw. If either has no effect, see below-
it has a low idle. Can also be a vacuum hose leak.