Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
So you have no power on the black wire?
This wire comes directly from the battery. You likely have a break in the wire coming from the battery. You can run a brand new wire from the starter positive to the post that the black wire goes to. Unless you can locate the part that is damaged.
If you have an aftermarket alarm than this could be why it came disconnected. Make sure you get it reconnected with a good clean connector so this does not happen again.