Let's put it this way, looking at it, it seems my car has had 3 different alarms installed, poorly. Then when I replaced my carpet I saw so many random wires in the center console it was scary. I actually tested a few and I found one was to my dash lights, however the fuse to it is getting no power whatsoever, but if a run a switch between that wire and one of the 20 amp connections they work fine. I have problems with my blinkers, lighter, everything in the dash. So, I feel it is necessary to replace that harness. Camaro heaven sells complete ones, however, I need diagrams and lists of the connectors to see what really needs to be done. BTW, the firewall ground or whatever it's called is good.