ashadow

OK. So I replaced my alternator and useing my power inverter it showed it was puting out up to 18 volts. I then shut the truck off and now have no power to my ignition. The next day i was trying to check for my fuseible links and of course can't find the dam things and when I check to see if I had brake lights ( which came on) I had power agian. So I started the truck and checked the power going to the battery and it did'nt seem like it was getting a charge, but at the lighter it was still putting out too much voltage. So I shut the truck off and now I'm back at square one with no power to the ignition. But my headlights still work. Anybody have any ideas?