Try pulling the steering wheel one way, or the other while turning the key.
This is a dirty throttle body. Very common on our trucks.
turn signal arm
Does it turn over? Compression, Fuel, Spark?
Probable causeFlasherFusecontrol lever
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.
did you check your battery and alternator?
I believe it is in your glove compartment there is an access to your flasher.
push up and turn on the housing
turn signal & wiper relay for a 1998 Chevy blazer
Aren't they different flasher relays