had the same problem with my ronix 8.3 4700gph pump tripping my main breaker when using the stock 12v socket--they say it's rated for 25 amps. i wired up two new sockets (for two pumps) near the battery compartment with each wired direct to a separate battery using 10gauge wire, maybe a 2' run on the wiring. the new wire and sockets have never been an issue since.
'88 Sunsport, 2250lbs ballast, automated surf system, home made surf exhaust, surf flap, ACME 913, Krypt 6.5 HLCD's, Perfect Pass Stargazer
2007 Centurion Typhoon to be upgraded this winter!