Alternator again ?

Replaced my alternator about 3 months ago, due to my lights dimming, flickering, radio turning off, and whippers slowing.. Alternator tested good, but i checked the grounds, cleaned them and all looked fine. Thew new alternator seemed to solve the problem for the most part, accept for the lights still would occasionally flicker after the new alternator. Yesterday i was out driving on a hard bumpy frozen road and the car was bouncing around a bit and when i was done the lights are back to dimming, radio cutting out. I checked the ground on top of the engine, as well as the one on the thermostat housing.. The one on the trans i just cleaned not long ago while putting a new clutch in. Do ground wires themselves ever go bad? Think i bounced something loose ? or bounced the alternator to death >>?
Comments
especially if not properly secured. Bunjee straps don't count as properly secured. If thats ok, replace the ground cable from the transmission to the chassis to the battery negative terminal with a NEW one.