Join Date: Mar 2002
Location: Austin, TX, USA
There is a guy on the board here that goes by choptop. I helped him solve a similar problem months ago. He had power at the ignition when it wasn't running, but try to start it and the voltage would go to zero.
Those old camaros have a resistance wire from the fuse block to the ignition power feed. When guys convert to electronic ignition (HEI), they often replace the resistance wire with a solid copper wire. In choptop's case, the previous owner had tried to spread open the crimp on the old connector and attach the new copper wire to it. It was topped off with a solder job (solder doesn't stick to brass terminals). Over time, it shook loose and presented almost 70 ohms of resistance to the ignition line. We verified the connection by measuring resistance between the ignition switch terminal and the ignition unit with the battery disconnected and the ignition on.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI