Ground wire gauge?

[turbomacncheese]

Most of the plugs have ground wires that look like 18-20 guage, but where they join together, and also the runs between grounds, the wire is thicker. I can't tell if it's 14 or 16. I'd like to order just one spool to get this sorted. I know the 14 would be "safer", but I don't want bigger wires than I need. Help?

[Big Blocker]

The same size as he power wire is enough for most items but IF you are combining several ground wires together and then running just one larger ground wire to a ground point, increase it's size as a safety factor: 4 #14's combined into a single #12.
Best way to think this out is, IF everything [connected] was turned on and running, what is the total amperage draw that returns thru the ground. Gauge it accordingly . . .

Doc

[Ajzride]

Poor grounds will cause all kinds of unexplainable gremlins. Just bite the bullet and use a #14 or #12, it won't make that much a difference in the bundle size overall.

[turbomacncheese]

I'm replacing the ground circuits on the factory harness. My figgerin is that Subaru already did all the calculations, and if anybody knew the size I should just use that. I'm not the kind of guy to go re-engineer an actual electrical engineer's design choices. I'm taking special care with the ground circuits because I definitely don't want any gremlins. I just don't want a bunch of hacked-together wires responsible for grounding. Most of the other wires just needed to be shortened, so that was nice.
Of course, like I said, it does seem to be smaller than 14 so that's what I'll use if nobody knows for sure.