GP 360 Radio Charger
On a Motorola charger, when the battery is charging the light should be a constant red (or amber depending on the charger). When the charge cycle is complete the light will change to solid green. Sometimes the solid green time is brief, as the battery will begin to lose charge, and the charger will go back into trickle mode and change once again to red (or amber). In most cases, a flashing light indicates a problem, such as a bad or shorted battery, an incorrectly seated battery, dirty battery contacts, or a bad connection with the battery. (Note: Batteries last 18-24 months typically. Check your date code for the age of the battery.)
There were several chargers made for the GP360, including but not limited to a 60-minute charger, a 90-minute charger, a 10-hour trickle charger and a 6-unit gang charger which would be a rapid rate, either 60- or 90- minute. If you would supply your charger's model number we could tell you which one you have.