I was playing around with my '70, and I couldn't get the "radio" circuit to energize ( yellow wire).

Correct me IF I am wrong, but this circuit should be "on" in both "Ign" and "Acc", correct?

I checked the fuse box, and NO power on either side of the fuse OR the "Wiper" fuse. Not much corrosion at the fuses, and ALL other fuses had power...

Looking at the wiring diagram was a little confusing. It looks like a 12 Ga Brown wire goes to the ignition switch, but the diagram also looks like a 12 Ga Orange wire is also supplying power ( I know it shouldn't be both, perhaps the Orange only go to the TCS solenoid circuit?)...

I want to trace the circuit, so should I look at the Brown wire at the ignition switch?

Right now, I am trying to avoid pulling the fuse box apart/out... Thats doesn't look like a fun job with the hood on and power brakes...

Thanks...

I was playing around with my '70, and I couldn't get the "radio" circuit to energize ( yellow wire).

Correct me IF I am wrong, but this circuit should be "on" in both "Ign" and "Acc", correct?Yes

I checked the fuse box, and NO power on either side of the fuse OR the "Wiper" fuse. Not much corrosion at the fuses, and ALL other fuses had power...

Looking at the wiring diagram was a little confusing. It looks like a 12 Ga Brown wire goes to the ignition switch, but the diagram also looks like a 12 Ga Orange wire is also supplying power ( I know it shouldn't be both, perhaps the Orange only go to the TCS solenoid circuit?)...
12g red (battery power) supplys power to IGN switch. 12g pink and 12g orange leaves IGN switch, supplys power to other circuits (IGN on only) 12g brown leaves IGN switch supplys power with IGN on or ACC on.

I want to trace the circuit, so should I look at the Brown wire at the ignition switch?
Yes. It needs power or the radio circuit won't work. You may have a bad or misadjusted IGN switch, or a wiring problem.

12g red (battery power) supplys power to IGN switch. 12g pink and 12g orange leaves IGN switch, supplys power to other circuits (IGN on only) 12g brown leaves IGN switch supplys power with IGN on or ACC on.

Yes. It needs power or the radio circuit won't work. You may have a bad or misadjusted IGN switch, or a wiring problem.

Thanks...

I think its the ignition switch. I tested it, and no power from the Brown wire terminal. But jumping the hot to the brown wire DOES engergize the radio circuit, so the wiring and fuse are okay... the other circuits on the ZIgn switch are okay ("IGN", and "Start", etc)

Kind of a bummer, as I already bought a new ignition switch, but its for a tilt column I am putting in (currently, a non-tilt)... I need to finish painting that column first, and then install... But in the meantime, I am planning on taking the car to a local Chevelle show on Saturday (Therefore, no time for me to finish and install the tilt before then)...

I think I will just jump a wire between the "IGN" and "ACC" terminals at the fuse box, so my stereo will work... :thumbsup:

THANKS

I think I will just jump a wire between the "IGN" and "ACC" terminals at the fuse box, so my stereo will work... :thumbsup:

THANKS
The IGN terminal at fuse box is protected by the DIR SIG HTR fuse. Putting that jumper in means the radio will also be powered by that fuse. The DIR SIG HTR fuse might blow more easily with a heavy extra load on it, (ie... turning the dir sigs on) carry extra fuses or just do without the stereo for now.

The IGN terminal at fuse box is protected by the DIR SIG HTR fuse. Putting that jumper in means the radio will also be powered by that fuse. The DIR SIG HTR fuse might blow more easily with a heavy extra load on it, (ie... turning the dir sigs on) carry extra fuses or just do without the stereo for now.

I will carry extra fuses. I don't think the stereo pulls too many amps...

Now that I think of it, the stereo was plugged "directly" into the "Ign" terminal before I rewired things, so it should work fine ( I hope)... I guess there was a reason why it wasn't plugged into the "ACC" terminal ( I bought it this way)...

Basically, when I was cleaning up the wiring, I decided to splice the radio power into the factory radio circuit/wiring, for a cleaner install...