low voltage problem

Discussion in 'The Welcome Wagon' started by gwmcgowa, Feb 24, 2010.

  1. I have an 89 mustang lx 5.0 and I am having low voltage problems. I have replaced the stock alternator 3 times and tried 3 different batteries and the voltage at idle rarely passes 11.8 give or take a tenth. This causes the car battery to lose all voltage and the car shuts off and needs to be jump started. once its jumped, it will run alright until i shut it off again or it dies, and then it will need another jump start. Any input?? I just ordered a 140 amp alternator to see if that helps and i will be buying a new bigger battery as well.

    I can give more details about the accessories I am running if need be.
  2. Post this in 5oh Technical forum and also take a look at the "Useful Technical Thread Index", in that forum.
  3. will do thank you