Wiring Routing Question

The continuing saga repairing and rationalizing the wiring sadness on my GTM brings me to today's question. The tunnel harness on my GTM runs through the tunnel where at the end it goes into the engine compartment around the outside of the frame member there into the area under the Corvette fusebox. The blue arrow traces its path. This seems to be the routing shown in the photo on page 333 of the original manual or on page 353 of the later manual (R E V I S I O N 2 D , A P R I L 2 0 1 4).

It seems to me this is asking for future trouble because it is extremely close to the Kooks exhaust. Did anyone instead run the harness on the inside of the same frame member thereby keeping it out of the engine compartment? That would be the path marked by the red arrow. In my case, there is sufficient room between the aluminum tank and the frame member.

Attachment 164016


Attachment 164017

I'd say if there is actually room between the fuel tank and chassis for the wiring to run.....and the tank is anchored to the chassis so that it can't move....I would agree that that would be the best routing. In almost 40 GTM builds, I've never seen an example where there was enough room there to prevent the fuel tank from pinching the wires there....so we always use the blue arrow route and just make sure that the wire harness is insulated and secured as far from the exhaust as we can get it.

Our race GTM, of course, has a bit different tank configuration, but yes, the wiring is run where your red arrow is. We basically run fuel lines, electrical, etc. as far away from the engine and as far down low as possible. I would also caution you that the panel adjacent to the header gets VERY hot. You might think twice about where you have your terminal block mounted. I would highly recommend wrapping the headers at least up to the collector flange. I use Lava Wrap from Jegs on the race car and it holds up well.

Thanks guys for the answers. Much appreciated. There is only 2" between the exhaust and the harness in the original position and the wiring harness's corrugated sleeving is showing signs of heating. I seem to have the room at the tank corner for the wiring no matter how the tank is shifted and I am not above considering cutting that corner off of the tank to insure an adequate opening. So, it looks like i will try the inside the frame (red arrow) course because I just don't want the next guy to own this car asking the question, "If he was in here, why didn't he fix the problem?"

As far as the heating of the terminal strips goes, they are attached to a panel mounted on standoffs about 1" away from the header adjacent panel. But you have me thinking and I will put some sort of insulating sheet on the engine side of the panel.

Instead of using just the corrugated plastic cover, my suggestion would be to use Flame Guard. It is expensive at about $10 a foot, but can handle extreme amounts of heat.

https://www.anplumbing.com/black-fla...-cut-10ft.html

Original builder did that and I intend to use something more protective. What you suggest seems to fit the bill.

I can say every wire or cable I have in or around the engine compartment, even behind the factory sheet metal panels and heat shield panels I have made, have Therma-Shield protection. I believe this is protected up to 1400 or 1600, I'd have to look it up again.

My builder believed in plastic corrugated "shielding" practically everywhere near the engine
.