Your model Vibe appears to have a Lippert Through Frame Slide. The slide motor wiring is underneath inside the frame and not in the overhead. Additionally, the slide 12V lighting for the dinette and sofa is routed underneath up through the slide room via a flexible umbilical cord.
Are you saying that after the topper installation the slide didn't work? No response from the slide when you attempt to move the slide out? As previously stated, I would be checking the fuse first. A picture of your topper installation would be helpful.
'07 K3500 Silverado LT Crew Duramax (LBZ)
2016 Salem 27RKSS
1984 CHEV SCOTTSDALE K20 2GCGK24J0E1XXXXXX (Chevrolet Legends-Class of 2019)
"...exhaust fluid? We don't need no stinkin' exhaust fluid"