40 Radio and Heater Hook-up

[Pech33]

I had my radio upgraded to am/fm/bluetooth inside the stock radio, 6 volt positive ground. It still has just one wire and it’s connected to the left side of the circuit breaker. With the ignition off, the radio works. With the ignition on, it works. Any ideas? I guess I could connect it to the ignition switch. Was it originally connected at the circuit breaker because of suppression issues?

Heater: I have a new harness with the short green wire with a spade end on it. That gets grounded. Where does the long one go? Kube’s book says it goes to the ignition terminal with the red black tracer wire. I’m red green color blind. Does it go on the “com” or “gage” terminal?

Thanks.