All the winch set ups we have use an external isolator 500amp. The reason being if you are using the solid state solonoid packs, they can stay in the n/c position or on if you like when water gets through the seals. Thats the reason for an external isolator. Quicker than popping the bonnet and trying to disconnect before the winch o/loads:D
Go to Jaycar electronics, you'll be surprised how well priced a 500amp keylock isolator is.
Justin

