Battery light comes on and off

2valve_stevie

New Member
Aug 12, 2019
2
0
1
19
San Diego
Im stuck. I have a 2000 mustang gt with a stubborn battery light that has a mind of its own. Ive had the battery tested and replaced the alternator. Also tested the battery terminals connections its all good. The only thing that really seems to keep the light off more is if im running A/C. I'm not sure why this would be but it is. Any tips?
 
  • Sponsors (?)


wmburns

SN Certified Technician
Aug 14, 2009
5,360
417
164
Houston Texas
We need to what the actual battery voltage is when this problem is happening.

It would also help to know for certain that the voltage drop is within the 0.25 volt specification for the positive and negative side. This will make future trouble shooting more effective.

Howto perform charging system voltage drop test

There could be a lot of little details in a real trouble shooting session of the battery warning light circuit. Not fun if it's not necessary.