1986 Isuzu Impulse Electrical/Startring

Drove home from work, all is fine. Battery charging fine according to gauge. Parked car. 3 hrs later, turned the key. No dash lights, no accessories, nothing. Cables SEEM fine upon visual inspection. Cleaned the terminals. Attached jumper cables from working vehicle. Still nothing. Assuming cables are good, I installed a new ignition switch and new starter relay. I now suspect fusible link. (I should have went there first, right?) Would the fusible link cause COMPLETE electrical failure to accessories?