i am hooking up my system tomorow and im really not sure where to drill a hole in the firewall to run my 4 AWG cable any suggestions any pictures would be helpful thanks!
Check first for any factory made holes that are not in use or have extra space to be used. If you are explorer is anything like my Taurus I would say somewhere near where your steering wheel connects to the firewall. But it will be kinda risky around that area since you would have to be careful for your power steering.