For now, i will continue monitor the battery voltage. Whenever I get time to open the radio, i will verify the yellow cable power.

I would like thanks everyone who stopped by my thread, reading the issue and replay with some good suggestions.

One last think, I would like to know. Other then TomTom app, is any other app can I use to avoid startup error message (stable app)? For my radio spec, see post #19 (very bottom).

Thanks