I am so frustrated right now. From the beginning: About 2 months ago my Cat died on me. Purring along and just lost the spark. It would crank, but wouldn't fire. On advice, I ran a jumper wire from the battery to the coil and it started. I figured that meant the problem had to be either the ignition switch or in the wiring from the switch to the starter relay. Ever since I ran the jumper wire to the coil (HEI type- in the dist. cap), when I turn the key all I get is chatter from the relay. I've put a new igintion switch in and a new starter relay in as well as new battery cables, including from the relay to the starter. I traced the wiring harness and, at the voltage regulator I found where a PO had spliced in a connector pigtail from some other model car- the wires were different colors. All four wires were loose at the splices. I fixed those hoping that would correct the problem; it didn't. I know I'm getting 12 volts to the relay. I've checked all the ground connections and made sure they're tight. I don't know what else to check. The starter was working fine when this all started, so I haven't taken it off to test it (headers). I've never heard of the starter causing the relay to chatter, although I guess it's possible. Please help!