help me find my grounds under the hood
 

I'm trying to find my grouds under my hood, I'm going to be cleaning and adding 4 guage for them mainly for stereo purposes but also just for general reasons i know they are old and could use it anyway. I cant find my motor ground which is the last step for my big 3 upgrade, so i need that then i want to replace every ground i can find under the hood with my spare 4 guage i have laying around it is free and i have time if anyone knowes where they are can you help me find them please id really appretiate it :)

Battery ground is hidden by the headlight, where the engine bay has a turn.... not sure if you get what i'm saying. I'll try to post a pic later.

Motor, I think you ground to the alternator to the chassis. I've been told the engine is actually the ground for the alternator.