[99 to Life]

what harness are you referring to? an aftermarket wiring harness or stock s10 harness/engine harness? How big a hole you talking about? they make grommets, but not sure how big they really go and or how big of a hole you are talking about. When I wire headlights for example using aftermarket harness, i'll route them through the cowl area and up the front fender to hide them. or you could run just those wires out through its own hole in firewall and run them up along the inner fenders. Options are endless, just need to give us some pics or info.