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loudhvx wrote: Stock main fuses were 30 Amp on the Spectre, probably for extra lighting load. You can probably get away with 20 amp mains.

The stock diagram shows the reg/rec feeding the battery directly. I threw in an optional fuse, which is up to you if you want to use it.

And I showed the reg/rec feeding the positive side of the starter relay. This is to make the battery connections neater. The battery only needs one big positive wire and one big ground wire going to the engine. From that point on the engine you run a small ground jumper to the frame ground piont.

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loudhvx wrote: The wire gauge depends on what average current it runs. These are typically what I use, but are not really set in stone. Mostly I use 16ga, but with some 14 near the charging system and battery. The thin black lines are mostly 18 ga., but a few can be smaller, like the pickup wiring.