1992 Chevy S-10 slowly losing accessorys

1st to go was the heater blower would go off on it own sometimes but then a passenger door closing would get it going again. That doen't work anymore. Then I noticed then lights for the power rear view mirror no longer worked but the interrior light worked fine. Then I noticed the 4x4 switch wouldn't work. Truck starts and runs fine, sometimes the fuel pump is slow to pump like it needs a second cance to activate when I turn the ignition switch on/off til I hear the fuel pump. I asked around and someone said fusable links and possible negetive lacking. I dunno, but I thought someone here might. Thanks in advance. I have no cash hence I'm doing it myself and still driving a 1992.