I have tried the best electrical tape I could find on my wiring but none holds up to the 100°+ Texas weather.
I got this tape from Del City - Electrical Supplies & Professional Grade Wiring Products at about $8 a roll. It is Self- Sealing Silicon tape. It comes in red & black and is 2 or 3 times thicker than regular plastic tape. It does not stick to the wiring but only to itself.
Within 24 hours it forms a solid rubber, watertight jacket that will stand up to 500° of temperature. No heat gun required like with shrink tubing!

I worried about adding a wire later but it is very easy to remove if necessary by just lightly cutting the outside and pulling it off since it does not stick to your wires and then re-apply new tape again. No unwinding and tugging to get it off.

I have used it over split plastic wiring looms but it works just as well alone over the wiring. I wish I had of used this tape first and forgot the split-looms since it looks too fat. Will probably re-do the split-looms!
I have already done the mid-cab forward and cannot wait to do the rear wiring.
One picture shows tape that has been removed with an original roll of tape.
TractormanBill

 

I'll have to get a roll or two of that, looks like just the ticket! Can you unwind it to add a wire? Seems like everything 3M makes is first-rate.
Self-fusing Silicone Tape

 

I used every kind of 3M, etc. but nothing stacks up to this. You can unwind it some when you are first applying it but after it sets it is a rubber tube that will not come apart.
I broke one connector and had to remove about a foot of it but it comes off real easy if you just cut it lightly since it does not stick to the wiring.
Bill

 

FYI, I did a quick sweep on eBay and found other self sealing silicone tape in a variety of colors, even a clear. Looks like a well used item in the communications industry.
Good tip, thanks. Will be doing Maters' wiring in the spring.

 

Might watch the temperature range on the tapes since some are well below the 500°.
TractormanBill

 

That looks really nice!

How many rolls of the tape did you use under the hood?

 

I have a few rolls of it. We called it "Cherry Tape" and used it on everything when I did electroncis in the USMC

 

Also known as self-amalgamating tape, we use it a lot in offshore oil, great stuff.

 

I think I used about 2 or 3 rolls.
I did across firewall, wires to AC dryer on right inner fender panel, wires to in front of radiator, fan wires, engine wires, dimmer switch, electric fuel pump under cab and possibly several more.

I would tape the wires together every 4-6 inches with regular electrical tape to form the loom and then go over that with the silicone tape when you think you have all the wires necessary. I burned a lot of regular tape adding wires and taking wires out till I had it the way I wanted it. When I used the split wiring looms it makes the thing look too bulky. I did one or two without the split looms and they turned out great.

As you are wrapping you can back up a 1/2 turn or so but not much more as the tape sticks to itself pretty good but after 24 hours you have to cut it off.

There is clear non stick tape between all the wraps on the roll of tape to keep it from sticking to itself. Hard as Hell to hold on to while wrapping as I kept dropping the roll. After a while you will get the hang of it. You tear about a foot of the clear off as you are wrapping.

It is a real breeze to remove the silicone tape if necessary later by just lightly cutting it and it comes right off since it does not stick to the wiring.

Will probably go back and take the split looms off and just go with silicone tape.
TractormanBill

 

I use that to make wiring harnesses for motorcycles. Learned about it through my work when I would need it to wire up industrial control panels. Good stuff, I hadn't thought of sharing the idea. Instead of using regular tape to make the loom, I use small wire ties and remove them as I wrap.

 

I used a lot of tie wraps at the start but the small tapes hold it in shape and you can just go over it without having to remove the wraps especially on long runs.
TractormanBill