         
Ford 3G Alternator The wire leading to the "A" terminal of the 3G alternator regulator that carries the full battery voltage acts as a "sense" point for the voltage setting and supplies the field current. Any problem with this wire (colored yellow in most applications) and the regulator connector plug will have a drastic effect on the charging system. The alternator may charge fine or carry the load but have severe voltage fluctuation. The simple culprit is that the newer Ford wiring design incorporates a fuse in the junction/relay/fuse block in the compartment marked "Alt". It is the "A" wire feed to the alternator. Overcharging GM & Fords Overcharging or an intermittent overcharging can cause electric windows, air conditioning and ABS systems to stop working. These accessories are all controlled by separate control modules that work on battery voltage. These modules are designed to shut down if the voltage goes to high. 
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