P2503 Dodge RAM 1500 - Charging System Output Low | Step-by-Step Diagnosis

P2503 (Charging System Output Low) on a Dodge RAM 1500? This video walks through the complete 9-step factory diagnostic procedure with the wiring diagram and connector views - no guesswork, no parts cannon. When monitored: The engine running. The engine speed greater than 1157 RPM. Set condition: The battery sensed voltage is 1 volt below the charging goal for 13.47 seconds. The PCM senses the battery voltage turns off the field driver and senses the battery voltage again. If the voltages are the same, the code is set. One Trip Fault. Three good trips to turn off the MIL. In this video: 1. Active DTC 2. Fused B+ Circuit High Resistance 3. Excessive Resistance In The Case Ground 4. Generator Operation 5. (K20) Gen Field Control Circuit Shorted To Battery Voltage 6. (K20) Field Control Circuit Open 7. (K20) Gen Field Control Circuit Shorted To Ground 8. (Z20) Ground Circuit Open 9. PCM Possible causes covered: Excessive Resistance In The Battery Positive Circuit; Excessive Resistance In The Case Ground; (K20) Gen Field Control Circuit Shorted To Voltage; (K20) Gen Field Control Circuit Open; (K20) Gen Field Control Circuit Shorted To Ground; (Z20) Gen Ground Circuit Open; Generator; PCM. Applies to the Dodge RAM 1500 third generation (2002-2008) with the 3.7L V6, 4.7L V8 and 5.7L HEMI V8. Similar logic applies to RAM 2500/3500 gas models of the same generation. This is general information for educational purposes - always confirm against the service information for your exact vehicle.