digitrax question

[adari]

My ut4 radio equipped model is not working when i put a 9 volt battery in. The battery worked fine in my dt 400 radio.  My ut4 radio is showing green at first in the status circle but then i turn the loco address bar while its plugged in (because it wont worked if you dont plug it in) but then it changes to red.
any suggestions
adari

[r0bert]

see general section

[Running Bear]

Try another battery.

[adari]

thanks