I have a 98 Chevy blazer. I already installed alpine type s speakers in the front and back doors. i just got tweeters yesterday for my dash. I was wondering where do I hook the wires up to from my aftermarket head unit??? can anyone help me?

 

The tweeters run of your HU via the door speakers, so just swap out the tweeters and you will be good to go.

 

get a 4 channel amp and run them off from that bad boy