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Starter, Batery and alternator harness

EFI Wiring Fundamentals

Discussion and questions related to the course EFI Wiring Fundamentals


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Hi all,

I just did the 3 wiring courses. They are very ussefull and interesting tbut The harnesses built on it always harnesses with a very small wire gauge (20 or 22).

I need some advice, tutorial, info link... talking about big wire gauge harnesses.

I'm building a completely new wiring on my RX-8 Racecar and need some ideas to build the alternator, starter, and battery wiring loom.

Thanks in advance.

Well the wire gauge is going to be dependent on the current draw as well as the length of the wire. While we generally use 20-22 AWG for ECU wiring, all of this is relatively low current where that gauge of wire is completely fine. For the starter motor, alternator and battery wiring we need to step up the wire gauge significantly. 4 AWG wire will support approximately 150 amps and hence should be suitable for your alternator wiring. Depending on the application you may want to consider 2 AWG for your starter motor and ground straps which can support around 200 amps.

There's some great info in the following links which are rotary specific. The FD examples will be quite applicable to RX-8. Personally, I would running welding cable or 00AWG to the starter, especially if relocating the battery.

Alternator wiring suggestions: http://www.ausrotary.com/viewtopic.php?f=16&t=33676

Battery and starter rewiring (assumes battery relocation to the boot, but same principles apply for stock configuration): [url=http://www.ausrotary.com/viewtopic.php?f=16&t=31504]http://www.ausrotary.com/viewtopic.php?f=16&t=31504

Many thanks for your replies.

I 'm looking for some practical advice to build the harness. There isn't talking about it in any of the wiring courses.

I need to connect the Alternator (100A), Starter(100A) and Electronic Power Steering (60A) from the engine bay to the inside the cockpit on the co-pilot zone.