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Amp gauge keeps going left to right ?

I just bought this 74 Pantera mostly original, been sitting for a long time ! So I had to replace the carb to get it to run & idol, now I notice that the amp gauge goes left to right every 2 or 3 seconds with the dome light going bright and them dim.  I took the fire wall out to get a good look and notice that the previous owner has put a new alternator and voltage regulator in it as well as leaving his snap on small screwdriver and a jumper wire under the seat. My feeling is they gave up on trying to fix it.

Anyone ever experienced this problem before ? Where would you start ?

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