racerman1cars wrote:Hi, I just got a 2006 Chev ext cab z-71 and was wondering where the best place on the firewall to drill and gromet a hole? I had a 2005 and it had a flat place on the fire wall beside the steering colum, but this truck does not seem to have the same area.
Why does everyone always want to try to install a new grommet through the firewall? You install a grommet and you have to seal it up with RTV or some other form of sealant to keep the water out. That is a pain in the rear.
In all the years I have been installing two way radios, I was always able to add a hole through the existing rubber around the emergency brake cable or beside the steering column or in the grommet where all the wire run. Take a flashlight and look under the hood in front of the driver side. Look down to where the cables and such go through the firewall. You should be able to locate enough space to poke a hole through one of the rubber pieces there. Then go on the inside, pull down the floor mat and see if you can find the same rubber grommet. Use of a drill will allow you to make a new hole. Just be careful you don't damage any of the wires where your working. If it is one of the older vehicles, it has a real thin membrain and you can poke a hole with a Philips screwdriver.
Make sure the hole is smaller that the wire. That way it will self seal when you poke it through. If you make it too small, it may not go. A little silicon grease will allow the wire to slip through with ease. Have been able to run the high current wire in this fashion for 100 watt radios all the time. Even run the speaker wires for the siren units.