Wires

[CraigCam]

I am about ready to pull all the old 12v wiring and replace it. I am noticing there are two different size wires for the 12v, 14g and 12g. It looks like the outside marker lights are 14g and the interior wires for the say the lights are the bigger 12g.

* Do I need to do the same or can I use the same size for all?
* If so, can I use the smaller 14g, I plan on using all LED's in lights?

My plan is use a marine grade wire that has a protective sheath around the wires.

[GMFL]

Please use 12ga wire for all. The price difference is minimal.

[uncle_bob]

Hi

Are you going over to LED lights at the same time? I certainly would suggest it if you are tearing into things. If so, the current involved will drop dramatically. Wire size is current related, you probably can get away with number 18 for the lights after an LED conversion. The main advantage is that it's easier to work with.

Indeed for stuff that pulls real power, you want nice beefy cabling. You do need to be a bit careful about what goes where.

Bob

[A W Warn]

Originally Posted by CraigCam

I am about ready to pull all the old 12v wiring and replace it. I am noticing there are two different size wires for the 12v, 14g and 12g. It looks like the outside marker lights are 14g and the interior wires for the say the lights are the bigger 12g.

* Do I need to do the same or can I use the same size for all?
* If so, can I use the smaller 14g, I plan on using all LED's in lights?

My plan is use a marine grade wire that has a protective sheath around the wires.

If you know how to calculate the load, you can use required wire gauge based on load.
If not, bigger (lower gauge number) is better.