         
It is a well known fact that batteries do not perform well in cold weather. They still provide high currents but, because the internal resistance increases as the temperature goes down, it is the increasing voltage drop which takes away battery performance. At 32° F only 65% of starting power is available from the battery. This will cause excessive draw from the starter making it seem as though the starter is failing. It may also cause your alternator to work harder which will shorten its life. Ford has issued a TSB for replacing 65 amp alternator to 95 amp alternator. Service kit number F3P2-103466-G. This change is found on its early 1990’s F series. 
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