914 wiring harness issue_wire size in MM, 914 wiring harness issue_wire size in MM Options

[johnorm]

Guys I have an issue that I could use some help on. I'm rebuilding my 1973 914-4 wiring harness using AWG GXL wire. I have a schematic for a 1973 but the wire size, in MM's, is not shown. I found, on the forum, a file called "914_Electric_74_Current Flow (partial copy of that file is attached). In matching it to my harness I found a major issue, IMHO.

Of the four Red wires coming from the Battery - two are noted as 2.5MM (10/12 gauge wire) and two as 4.0MM (these 4.0MM wires (6 gauge) go to the ignition switch and the other to Fuse 11).

My question is this a typo / I'm reading it wrong because I do not have a 4.0MM wire, in my old harness, going to the Ignition Switch and Fuse 11, all four wires are 2.5MM or 10/12 gauge AWG wire.

Second question, if I have room for 10 gauge in the center tunnel should I run 10 vs 12 gauge just to be safe? GXL wire has a thinner sheathing compared to old PVC wire that I'm replacing.

Norm

[johnorm]

Guys

Thanks for the responses. Based on the information, and Tom's terrific schematic he provided, I think I will use a waterproof Fuse Block with one input and four outputs (100 AMP Max with any single fuse not to exceed 30 AMPS). The plan is:

1. The Fuse Block input will probably be 4 AWG wire from + Battery post;
2. Each of the four outputs will be individually fused;
3. The two 12 AGW wires will have 20 AMP fuses (they will go to the relay board Pin 12 and Pin 14) and the two 10 AGW wires will have 25 AMP fuses (to the Ignition switch and Fuses 10, 11 and 12);
4. The wires will be sheathed with a thermal block as they route through the engine bay.

It maybe overkill, but I have had a few electrical mishaps over my 60+ years and with a full rotisserie build I want to minimize any potential problems. I may do something similar with extra relays for the H4 headlights. I will post pictures when built and installed.