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There really is no other way to make a solid get through the firewall than to run it underneath. I think everyone here will highly recomend that you diconect that wire and run it properly, immediatly. Though it probably can be, that wire is not specifically designed to be exposed to the elements, especially under a car. I am sure there is a grommet somewhere, and if there isnt, then I'd suggest you do this right and just drill a hole.

Yeah you can run it under the car, but you need to protect it somehow. I use 3/4 ID flex tube or 3/4 ID pvc pipe for the ones I do. The PVC gives the best protection, but the flex is way easer to use. I also make sure I run the wire as high up the frame as I can, that way it is less likely to get hit by something.

I have flex tube around it and it is strapped as high as possible. It's less than a five inch length of wire actually under the car and I check the tube around the wire for damage quite often. So far I haven't found a scratch on it.

sorry double posted

i tried that once years ago and it was all good until one day something kick up and grabbed a hold of it and ripped it from the car....not good