4 guage or 0 guage for dual battery

[Sub]

500 amp CONTINUOUS Duty? I did a search, and found them. Wow.

By comparison, the GM factory solenoid for dual batteries (RPO TP2) is only 100 amp CD.

 

[ladorn45]

haha i know it is overkill but rather have room for upgrades in the future. I think my safe bet is a 200 amp fuse. Here is the selniod i got by the way got really good reviews.

NVX BIR500 500 Amp Relay Isolator