in need of assistance i drive a 02 2500hd and i have noticed a few things going on lately. like when the truck is either running or if the key is just turned to the on position and i use anything in the truck my volt gauge dips a little bit and come right back up . and the other problem i have is when i am driving and i hit a decent size bump my gauges with reset and go back to working and battery light come on when it does this. only happens on certain bumps .... i have tried to recreate the problem at idle but cant so please and suggestions would help

 

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