Congrats on getting good harnesses. Just because they're new, doesn't mean that they will work. I bought all new harnesses from YO and the front headlamp harness had a wire that had not been stripped back before the end was crimped on. Took a while to find that problem. Glad I attended those GM factory wiring classes now. Just to be on the safe side, I eliminated my amp gauge as well. They cause more problems than anything else, even with new wiring.