01-20-2016, 10:45 PM
That wire cover looks like a spring? If it does, then it is shielding, and the shielding is grounded to the chassis somewhere. You can find the lead inside the shielding running between the IF's padder and the junction of those two resistors. It looks to me. Others can correct me if I'm wrong on that. I'll try to look at one of my 66 chassis tomorrow to verify.
Charlie in San Antonio