Thread: where to run wires through the firewall?

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This is probably a dumb question, but where can I pass the wires through from the engine compartment through the firewall? I would like for it not to be obvious so it was thinking in the passenger side toe board right next to the trans tunnel? Any tips on where? Thanks

i run them very low next to the toe boards and run them so the wires come out for left and right side lights so two holes low left and right . the engine and alt wires just in back of the engine block were the dist will block them some what

Low next to the toe boards on the firewall (not actually through the toe boards?) on either side for the light wires and behind the distributor up higher for the engine harness?

I was only thinking about the engine wiring right now (don't have the rest of the wiring right now anyway). I have a chevy, but the distributor isn't where it should be its on the front of the engine , but lower under the water pump...not the like Fords . so if I run the engine wiring up there it will be a huge eye sore hmm..

Look in the area behind the brackets at the bottom of your firewall, from the top of the toe boards down. The wiring bundle can route behind them (some down the left some down the right depending on what you're running to), on the inside that will keep them behind the kick panels til you get up under the dash.

That sounds like a good idea Bob I was looking at that as long as i have enough wire to run it down there, in and all the way across from the passenger side to the drivers side. I think I am going to weld a piece of angle iron across under the dash (from one side at the seam in the cowl to the other) to mount my computer behind the glove box and then run the wires across that to the drivers side. I was thinking about the wires being in the way of the insulation and carpet and all when on the inside of the firewall so this should all solve that..

I should be good as long as I have enough wire..thanks guys!

Since my engine is set way back I ended up with the MSD in the engine recess, I bought one of these firewall pass through's from Watson's Street Works. There are about 10 wires, most in the 16 and 14 awg size

Originally Posted by 35fordcoupe

Low next to the toe boards on the firewall (not actually through the toe boards?) on either side for the light wires and behind the distributor up higher for the engine harness?

I was only thinking about the engine wiring right now (don't have the rest of the wiring right now anyway). I have a chevy, but the distributor isn't where it should be its on the front of the engine , but lower under the water pump...not the like Fords . so if I run the engine wiring up there it will be a huge eye sore hmm..

the engine wires just under the top of the bell housing . the light wires out just be low the fire wall .i make them like i said left and right side. so two holes. so theres no cross over to the right fender .i mount the coil on the in side of the fire wall with a thru hook up a long with the MSD box if you have one but do it any way you like i done many this way you only see wires for the dist and the wire for the alt

Pat - when you say "just under the top of the bell housing" do you mean up through the transmission tunnel? If so that wouldn't be bad because then I could run the computer wires to the passenger side behind the glove box and run the other wires to the drivers side without having to worry about having enough wire to run all the way across the dash (but I think I do have enough wire for that). the tunnel was built with a little extra space around the transmission so maybe they would fit up there.

evolvo - that sounds like an interesting way and certainly good with limited wire length. I don't have coil packs so I don't have to worry about that, but you ran the ignition wires through the firewall? sounds neat...too bad you don't have pics.

thanks guys