So... While we're here. Anybody have an educated guess as to the gauge of wire used in the original cables?

The common choices here in the US are 4-gauge, and 2-Ga. You can get others, but those two are the most common.

2 hours ago, Captain Obvious said:

So... While we're here. Anybody have an educated guess as to the gauge of wire used in the original cables?

The common choices here in the US are 4-gauge, and 2-Ga. You can get others, but those two are the most common.

Do you want me to measure it?

You'd be amazed the stuff I've found on EBay and Craigslist!

Steve at '240zRubberparts' shows a reproduction cable set as out of stock but they are available on the bay for the same price Steve was asking. I bought a set a long time ago and they are perfect.

eBay

Datsun 240Z Reproduction Battery Cable Set | eBay

At long last! A hand-crafted reproduction of the original style Datsun 240Z battery cable set. We've all waited a long time for this. For those of you who pay attention to detail and want to add th...

21 minutes ago, 26th-Z said:

Steve at '240zRubberparts' shows a reproduction cable set as out of stock but they are available on the bay for the same price Steve was asking. I bought a set a long time ago and they are perfect.

I don't think they are quite perfect @26th-Z there was no protective cover on the negative terminal on the early 240Z, just on the positive side to stop a short with the inspection cover.

Here are the original Nissan parts fresh out of their bags. Note the negative side only has the protective rubber cover. Yazaki was the supplier and their name is screen printed on the cables, just like on original spark plug wires.

9 hours ago, SpeedRoo said:

Do you want me to measure it?

That would be great.

Here's a clip from zKars notes. if I'm understanding the drawing correctly, he measured the wire diameter at 6mm (.24inch) and the insulation OD at about 9mm (.35 inch). I'm finding gauge numbers and wire diameters all over the place and am just looking for something similar.