Re: LED Light bar installation
Hi, I would personally go with the 10 gauge wire but the 12 gauge will be OK - both can handle 20A. There will be about 0.12 v extra voltage drop on the 12 gauge compared to the 10 gauge. Don't forget your lights will probably run at 13.2 v or so when the engine is running.
I would use a 25A auto reset circuit breaker. Circuit breakers are impacted by temperature, the colder it gets the less current they handle. A 25A circuit breaker will trip at about 19A (continuous ) at -4 degrees F and at about 21A (continuous) at 10 degrees F.
Don't forget to use good quality connectors as you will increase the resistance if the connector is small or loose.
Good luck with your installation.
2013 Grand Cherokee Laredo CRD - White
2011 Wrangler Sport - Blue