Beleive it or not, 11.6 volts may not start your car, if the batterry is on the high side of its lifespan, it;s cold cranking amps and the alternator may be gone, on Fords when the alternator dies, so will the car, and it may give one quick Battery light, and it may not! I will tell you if you change the batterry and dont check the alternator, you will run into the same thing, test alternator with a know good and fully charged battery.
https://www.2carpros.com/how_to/how_to_test_alternator.htm
DO NOT leave a weak battery in it with a new alternator as alternator death can occur!
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Monday, January 25th, 2010 AT 6:02 PM