cobra93

Go with the larger port.

Either check to see what size ends you'll need or order the smallest hole size a plan to drill them out.
You want the hole size as close to the stud/bolt size as you can get.

Some type of distribution block should be fine, you could also use a nut and bolt to secure the lugs together for the different size cable.
If you do this with the power wire be very careful not to let it ground out, obviously.

I went to a local bouting store and got some remote battery terminals or something like that.
Basically it's a stud incased in plastic, you mount the plastic to whatever and stack the lugs and tighten down the nut.
I can't find any pics of mine.

I'd go to your local Menards and get the correct size waterproof strain relief,
Grommets give me nothing but problems.

http://www.menards.c...0760-c-9538.htm

lol I use those all the time at work lol! they are great little guys! although in this case I would definitely use grommets as he is just passing the wire through

Passing it through the fire wall is the ideal time to use them.
The cable won't move once it's tight and grommets aren't waterproof.
If you get the correct size grommet, it's a pain to pull the cable through without the grommet pulling out of the hole at some point.
Now you have to get the damn thing back in or pull the cable out and start over.

These are less than $3.00 at Menards and I'd gladly pay more than that for the lack of problems when using them.
The hole still needs to be drilled anyway and it'll be alomst the same size either way.
Why not use the strain relief?

Good point. I guess I have always been lucky and never had to go through my firewall!

Get what this guy suggests for a PAIN  free life and install lol! Next time i have to go through my firewall I will most likely being using these also, mostly because Cobra brings up a good point and I have them readily available at my disposal!

I wouldn't say "pain free", but I don't feel the need to smash something with a hammer afterwards, like I do when using grommets.

I would model the system and try to keep the port velocity to acceptable speeds.
You will have to search for what is considered acceptable, different numbers depending on different people.
Also keep you eye on whether it's measured in metric or standard in whatever program you're modeling the system in.

Ahhh iv never heard of menards... But where does the seatbelt wires go through the floor?

Any local builders supply store should carry them, Lowes, Home Depot or an electrical supply store could have a better selection.
Either way I'd use the plastic ones not the metel ones.

Sorry, You'd have to drive to Akron, Ohio to get to the closest Menards.