Battery waring light will come on intermittently. The passenger side air bag light comes on intermittently too. No other signs though, lights dimming, etc.
ideas??

 

al50bmgshooter, for your problem, I would tell you to connect a multimeter across the battery and then start the engine. Did the voltage jump from 12.6 (motor not running, not cranking the engine) to about 11.0 (while cranking the engine) to around 14.4 (for the first 30 seconds or so after starting the engine) and then finally ramping down to 13.7 VDC (where it should stay as you start electrical loads inside of the car)?

If you are seeing a final voltage down around 12.8 VDC (or anything under 13.0 VDC) then you have either a bad alternator or a battery wiring issue. I would first start with replacing both of the battery cables as this is the more likely suspect. The alternators in our cars are pretty beefy and the possibility of them failing is pretty low. The cables are much more likely.

Also, when the battery light comes on, does it seem to come on when you are up in the RPMs, but never with the motor at lower RPMs. If this is the case, then that will isolate it down to the alternator. I have seen similar issues with other Ford alternators and them acting this way.

What year is your car. I will look at the diagrams and make sure that we are not possibly looking at something else.

 

02 sport 3.0. I'll run the meter tomorrow and see what I get. The light doesnt seem to be related to the rpm. Like today it didnt come on at all

 

battery measured 12.4, started and it jumped to about 15 where it stayed, turned it off and them went down to about 13.4.
no corrosion at battery post and connections are tight

 

al50bmgshooter, I know this is going to sound funny, but get your battery load tested. I bet you will find that it is toast. It is the battery that is causing all your issues.

 

I will get that tested. The light hasnt come on now for several days. Could this cause the passenger side AB light to come on for no reason??

 

al50bmgshooter, it is possible. When the battery starts to go, things get goofey inside the car. So, I would not be surprised.