There is problem with the charging system.
Motorcraft BXT - 59
It means there is a problem with the charging system. Normally this means the alternator has failed.
Your 2004 Chevrolet trail blazer and battery light indicator is always on because the battery has sufficient charge.
for a mustang made after 1993, the most likely location is underneath the battery tray, behind the front bumper cover
There is no reset for the light. The light is on because you have a problem with the charging system. Once the problem is corrected the light will go out. Normally the light comes on when the alternator stops functioning.
The 2004 Ford Mustang has 12 valves.
The 2004 Ford Mustang has a V6 engine.
Battery is not charging due to defective alternator or the battery itself needs to be replace.
The 2004 Ford Mustang is a gas-powered vehicle.
The 2004 Ford Mustang has overhead valves (OHV).
The 2004 Ford Mustang has a 5-speed manual.
It means your engine needs attention.