2004 mustang gt charging issue


New Member
Mar 6, 2010
i have a 2004 mustang, the battery light comes on and it stops charging the charge indicator starts droping untell car dies. When you clean the bat terms and jump start it it will run fine for 2 days or 4 months just depends. any ideas or answers would be much thank'd reply here or at my email [email protected]. THank you
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SN Certified Technician
Aug 14, 2009
Houston Texas
Test the battery. Clean the battery terminals.

The alternator CAN NOT run without a strong battery. The days of jump starting a car with a dead battery are over. The battery is needed to excite the alternator field coil.

Bad-battery=low/no alternator output.

Once the battery and terminals are good, clean, and tight, if the voltage is stiill too low, have the alternator tested at the autoparts store.
I am with wmburns on this one.

Couple of other things to try.

Test the load voltage on the batt when you start the car if it drops below around 10.5-11V then your bat is screwed. Also check the charge voltage it should be around 13.5-14V at idle.

Good luck!