V6 Auto not starting and no electrics

Hi,

Having a bit of electrical trouble with my 93 V6 4runner, went and played in some mud and fairly shallow bog holes yesterday for a bit came home and went for another drive later that night with no issues. Get home stopped the car for about 2 minutes went to start it again and it turned over once and died on me. None of the electrics work, no horn no lights no hazards etc. I know the battery is fine as it reads 12.6 volts, the alternator has a bit of mud splash on it but I don't think its that, I've searched the forums and checked the 2 most visible grounds (from neg battery to the body and ontop of the plenum) I can't seem to find the last ground. I read that it could be the fusible link but I don't have a replacement for it. I was wondering where else I should be looking.

TIA