IIRC the 03 still has the old style starer relay solenoid near the battery. Should be a short positive cable from battery and a long cable to starter. The solenoid makes contact between those cables when 12 volt is present on the blue/red strip wire from key in start. if you don't have 12v on the blue/red when key in start the neutral saftey switch on transmission is suspect. Also have seen bad key switch.
Pay attention to the part about voltage drop testing the cable, something many pro mechanics don't understand.
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