wiring harness grounding

[civtir]

Hey ppl, I have got a wire harness for my 97 civic (the aerpro one AP1720), i was wondering whether i connect the ground wire of the aftermarket headunit to that of the wire harness, or i do i ground it to the chassis? Just like ur opinion on this matter, since the guy at autobarn said to do it to the chassis when i showed him the harness, but why, when there is a ground wire on the harness itself? thanx

[SIKCVC]

just quicker and easier to do it to the chassis... no big deal to which ever you do. Just make sure you clean the surface you earth it to if your earthing to the chassis.