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alternator/regulator problems

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so when my truck is at idle the alternator charges around 14 volts, which is normal id say, but the problem is when i turn on my blower and headlights it drops down and charges at like 12 volts


i think this is why I've been going through so many batteries recently :fs1: , any one have any ideas on why this happens? I'm thinking its a regulator issue or something along the lines, but knowing these trucks it could be a simple ground. 


any ideas or suggestions would be greatly appreciated, THANKS


(1986 2.5l 4 speed 4x4)

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