Is there a place to run amp wire through the firewall on 1999 Ford Explorer without drilling?

Yes, on a 1999 Ford Explorer, you can run amp wire through the firewall without drilling by using the existing grommets. There is a factory grommet on the driver's side that you can use; simply remove the rubber grommet and feed your wire through it. Ensure to seal the area around the wire with silicone or similar material to prevent moisture intrusion. Always check for any moving parts or sharp edges that could damage the wire.