Ok I'm putting the stock AM transistor stereo back in the Delta. It has a three wire plug one labeled 12v (12v input easy one), the next is SPK (I assume speaker), the last is GD (now is this the speaker ground or stereo ground), and it has a blue wire that comes out of the tuner *** and runs down the passenger side this if for ????. Any help would be appreciated.

 

I have a 69' Delta wiring diagram at home so I will check for you to make sure.

 

I checked the diagram and it doesn't show any radio wiring. I don't know why. That is something I never noticed before. I hope you can get it from someone here though, sorry.

 

If I recall the blue wire is for lights.& use the radio chassis for ground