Started having a flickering problem a little while back so I purchased a relay harness. I used the fuse box connection as my positive and ran the ground to the battery. Car would turn over but not fire. I moved the positive side down to the battery and ran the ground to another location, same result. I put all of the wiring back to stock and the car turns over just fine. Are the electrical systems in these late models that sensitive or am I missing something? Any input is greatly appreciated.