Ford 2003 Mustang Owner's Manual page 127

The fuses are coded as follows.
Fuse/Relay
Location
1
2
3
4
5
6
7
8
9
10
11
Roadside emergencies
Fuse Amp
Rating
— Not Used
5A Instrument Illumination
10A Left Low Beam
Headlamp
10A Right Low Beam
Headlamp
5A Instrument Cluster,
Shift Lock Actuator,
Rear Defrost
15A TR Sensor, Reverse
Lamps, DRL, A/C
Controls
10A TR Sensor, Starter
Relay
5A Power Antenna, RCU,
GEM
10A ABS
20A PCM Relay, Ignition
Coil, PATS, Radio
5A Instrument Cluster
Description
127