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What's wrong with it? If not working, most common problem will be a bad belt that needs replaced. I've repaired a few 8-track players so maybe can help if I know more details.
My bad for not being specific. My radio has 3 connectors in the rear. 2 of them are for the speakers; 1 connects to the driver's side, and the other to passenger side speaker. The third connector should be power, and it has 4 wires, this connector is the one I was looking for the diagram. Thanks!
Found this in another thread for the 1978 8-track:
"12 volts of FUSED power to what should be the YELLOW WIRE....the BLACK WIRE is a ground....and then an antenna. It is simple as that. You can get away with a 10 amp fuse in your 12 volts power supply.
The GRAY WIRE is for the light inside the radio when you turn your lights on."
Maybe not explained well, but one of the 4 wires would be a line to the power antenna I think.
Edit: This was in there too: "TWO yellow wires, one is radio power, other is antenna. Try either yellow wire to test it, but notice if the "stereo" light is on when the radio is OFF. If so, that's the antenna wire, use the other yellow."
Last edited by zxryder72; Dec 31, 2025 at 12:48 PM.
My bad for not being specific. My radio has 3 connectors in the rear. 2 of them are for the speakers; 1 connects to the driver's side, and the other to passenger side speaker. The third connector should be power, and it has 4 wires, this connector is the one I was looking for the diagram. Thanks!
I went through all this a few years ago when I had the 8-track repaired. I learned a previous owner had changed out speakers so I returned everything back to stock. 78s also have rear speakers so the schematic offers three versions...basic, stereo and stereo with rear speakers. But power color codes remain the same. See if this helps...this is a great schematic for 78s.
I didn't read that other thread carefully before. There are a couple of photos early in it that aren't the right ones, so it was a little confusing. This one toward the end seems to be the right one. '78 Corvette pace car 8-track.
Top black connector shows 4 wires. Black would be ground, gray for night lighting, two yellow. One of the yellows is for radio power in and the other goes out to the power antenna.
Last edited by zxryder72; Jan 2, 2026 at 08:32 AM.
I didn't read that other thread carefully before. There are a couple of photos early in it that aren't the right ones, so it was a little confusing. This one toward the end seems to be the right one. '78 Corvette pace car 8-track.
Top black connector shows 4 wires. Black would be ground, gray for night lighting, two yellow. One of the yellows is for radio power in and the other goes out to the power antenna.
Just to clear things up a little...
1 of the yellow wires is switched from the 20 amp Radio Fuse...
The second yellow wire is switched from On/Off radio ****
This second switched wire energizes the Power Antenna relay coil.
At the Power Antenna Relay you will also have a Orange wire...
On a early or 1st design 1978 this Orange wire plugs into the fuse panels BAT socket and is Circuit #40, On the late or 2nd design 1978 this Power Antenna harness taps into the Main Dash Harness and is Circuit #140.
Both are fused from the 20 amp CLK-LTR-ANT fuse
