Battery not charging

Tommy5fingers

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92 Mazda Protege
Battery not charging Help!

I have a 92 Mazda Protege 5 speed 4 cylinder. When driving at night the charge light comes on on the dash and after about 15 minutes the car dies. When checking the battery is just barely too dead to run the car. 4 new alternators have been put in and 2 new batteries. They both test fine. When checking the voltage across my battery while running without accessories getting 12.6 volts. I believe this is a wiring problem. It looks like the guy who owned the car before me tried to fix it but may have ran the wrong gauge wire and ran them too close to the engine block. Any idea what gauge wiring is suppose to run from the alternator? Any other advice?
 
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