That vexing electrical question post 49993

It is easier to post a reply here than to wade through all the varying ideas on auto-electrical matters.

I had a good look at the wiring.

6mm auto wiring..... red in colour on the outside. Approximately 60 thin strands of copper wire inside.

15amp 240v wiring. Orange on outside. Three covered wires. One blue, one brown, one green and yellow. Each covered wire contains approximately 30 thin strands of copper wire inside.

I used the blue wire to the negative terminal of the aux battery and brown wire to the positive terminal of battery. Brown wire fused with 10amp inline glass fuse close to battery terminal. Green and yellow wire not used. All three wires encased in orange cover and there should be little chance of it chafing or rubbing through. At rear of vehicle wires connected to cig socket which is stored in a safe place in the rear trim.

So 6mm auto wire looks to be the better option and will most likely use it. (More strands better conductivity?)

BTW I have hardwired and fused the Engel to the aux battery as well, with a 10amp inline fuse in place, using OEM wiring.

Thanks to all for you informative electrical kjnowledge but I am afraid that it went over the top of me head.....LOL

Cheers