Disconnect cables
remove hold down bracket
Lift out battery
bad battery cable connection , dead battery
Poor cable connections to the battery , or dead battery
12 Volt
According to the 2003 Ford Mustang Owner Guide : It came from the factory with the ( Motorcraft BXT- 59 battery ) * that's BCI group size 59 *
Sounds like you have a dead battery.
BCI group size ( 58 )
There is problem with the charging system.
lost battery feed
Please help me!!!!!
What engine ?
Get a ford mustang
The 1998 Ford Mustang owners manual shows ( 5 quarts ) WITH FILTER CHANGE