On the main wiring harness there are three grounding straps that bolt on to the heads I believe.

Here's my question do they all three go one one bolt to the drivers side head?

 

Well I'm getting ready to run it but I started wondering about this. There are three total connectors I put them all on the back of the drivers head on one bolt but I'm wondering if one should be on the back of the passenger side head as well.

 

it shouldnt matter, both heads are grounded so it doesn't matter what head they go on, the harness wouldnt know the difference.