Wire type/gauge ?

[wardejii]

I am rewiring a 1973 Scamp and another camper. Outside trailer wiring is done.
Planning on using red and black wire.
Using 12 g and 14 g for receptical’s
My Question is;
1. What gauge wire should I use to wire 12 volt lights and USB ports, (16 g)?
2. CCA, tinned copper, copper strand?

Thank you

 

[Joe Hogan]

How to Choose the Right-Sized Electrical Wire

Learn how circuit wires must be sized to match the ampacity of the load placed on them by using an electrical wire size chart.

www.thespruce.com

 

[Buly]

You need to know the Total length of the wire ( positive and negative combined)
Max amperage the circuit will see.
How much voltage drop is acceptable
Stranded wire is a must.

Wire gauge calculator