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If it does it when the engine is hot
its normal..
hotter temperture higher resistans in the wire ( ohms ) its normal
( im learning this in my class at school lol )
but if you want to be shure.. just clean the grounds... from battery to chassis chassis to engine block etc etc..
I agree, see if it does it again and check all the wires associated with the battery starter alt you could have a loose ground and /or bad battery connections. I hope your new alt is up to spec. New parts can go bad too.