I'm having trouble getting an AM radio working in my 1970 Sp. Satellite. I checked voltage at the fuse box. The main red wire terminal showed 10.9 volts, but the red w/ white tracer terminal (for the radio) only showed .01 volts. Surely,that's not enough to operate the radio, right? I have already cleaned all the connections at the firewall bulkhead. Any info. or advice is greatly appreciated.