ok. just the ground or both?

 

Just the negative will do just fine I like to do this everytime I change out something that will affect the running condition. I can't adjust the clock in my stereo so there isn't a downside to doing it

 

haha alright will do. thanks for the input

 

Remove the negative battery terminal and short it out against the positive post on the battery, this will remove all energy from the keep alive memory capacitors within seconds if you don't feel like waiting a few minutes.

 

even better! thanks. so just hit it on the positive terminal once? or hold it on for a few sec?