Cruise control not working

The cruise control on my 2002 Chevy 1/2 ton Silverado doesn't work. Went to boneyard and bought a module but it didn't fix my issue. Borrowed a multimeter and tested the cruise control module plugin. The only pin that came up with a incorrect reading was the first brake test. It's suppose to have 12 volts with brake pedal up but showed about 30, so I changed the brake light switch. Still no cruise control.

Since I have a high reading on the brake pin, do you think I have a wire issue there or would my problem be in the multi switch wires by the steering wheel?

Are you sure about that reading? Not sure how a 12v system can show 30v.

Are you sure about that reading? Not sure how a 12v system can show 30v.

You got me. I am out of town and will check again when I get home. I am real sure of the reading, since It made me think the brake switch was the issue. When you push the brake switch you do get crazy reading which the video I watched stated would happen.