Repairing Nicked Extension Cords

[Rikk]

Just to add to the data here for anyone searching...

When I have an electrical joint, usually 12v on a truck, motorcycle or especially a race car, I try to use the Grote brand, dual wall, 4:1 heat shrink tubing with adhesive inside.

I will always put one length of tube, extending a reasonable amount over the spice, then a second layer extending beyond the first. The heat melt glue inside the tubing seems to hold up to about anything and rarely fails. The 4:1 ratio allows plenty of room so you can use the same size tube for both.

Sometimes, when it's late in the evening or I run out mid-job, I will brush on a significant amount of liquid electrical tape, then position normal heat shrink tube, working it back and forth so the liquid extends beyond the joint then apply heat. Followed by a second layer repeating the process. 20 years ago I used this to repair a dirt bike wiring harness that was snagged on a branch and torn in half. I still ride the bike regularly and have zero problems.

Both of these seem to work about the same, but the Grote tube with adhesive is MUCH cleaner.