Quick fix? Expanding DC electrical capacity

[jmschmidt]

You have to use the same gage wire for both positive and negative. A circuit is only as good as its weakest link. I use #4 from the house batteries to the battery switch then to the DC distribution panel and #2 for the starter circuit and engine block ground. This is for a 460AH house bank and 115AH starting.

[Emmalina]

Originally Posted by rwidman

That's not a practical wiring plan.

Its actualy called a CAN bus ! They use it all over the place for Trucks and automotive industry. Not relays but electronically switched.