2006 silverado wiring harness

Sounds like you have now dead shorted a circuit in the vehicle. Time to either call a shop and see if they can come out to get you running or call the dealer and have it towed in to be repaired. No offence intended but you are a prime example of how trying to save a $ and installing it yourself can lead to huge $ to have the install repaired. In a newer vehicle where more and more functions are controlled by a single device, just tapping into a wire can have adverse effects on the vehicle itself. There is generally very little need to cut a harness these days with the adaptor plugs that are readily available. At this juncture in your installation, admit defeat and call a shop before you damage something like the ECM and end up paying out thousands of $ to have the vehicle repaired.