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
Does it turn over? Compression, Fuel, Spark?
Probable causeFlasherFusecontrol lever
turn signal arm
Maybe a bad switch
one of the lights is not working
Idle speed is computer controlled and is not adjustable.
Hyundai accent idle speed
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.
it has a low idle. Can also be a vacuum hose leak.
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-
did you check your battery and alternator?