Firewall in Chevy truck

[Bodawg111 10+ year member]

I currently have 4 ga. wire running from my engine, through the opening at the door (mistake #1; hard to shut door!), and then down under the threshold right next to my RCA's(mistake #2; obvious). I know this is not a good way of doing things so I want to drill a hole in the passenger side of the firewall and run down the other side of my truck (away from RCAs's). I know what size to drill (3/8s) and have a grommet. I just need to know where, or if anyone has any warnings of fluid lines, etc that i may run my precious drill through.

My truck is a 1993 Chvrolet full size, ext- cab.

Thank you for any help!

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[the_flatlander 10+ year member]

search for a grommet already in the firewall and put your wires through that