The Big 3 Are:
1. negative battery wire to ground - just replace the negative batt. terminal and wire and ground it to the factory location
2. engine block to ground - replace the ground wire from the engine block to the chasie with a bigger wire (maybe 4 guage)
3. alternator to batt - add a fused wire from the postive post on you alternator (the one comming from the battery) to the postive terminal on your battery. DO NOT exchange wires just add a extra one. make sure it fused the same size as your factory fuse.
hope thats helps
Note on #2- Some cars have a batt-engine block connection stead of chassis to engine block...