discharge/overcharge?

I got to check it some last nite, the voltage loss wasn't near as bad, its been sitting a couple of days and not ran so heat/running may affect it some. Looks like I've got about .5v drop through the ignition switch. I cant seem to find any literature on how to replace the ignition switch. I've looked at the service manuals online I've found but didn't see any replacement instructions for the switch. Does anyone have a link or instructions for this. I'm sure you probably remove the steering wheel and go down through the top but I'm not sure if it's cut and dry when you get in there or if I'll need any special tools etc. This may or may not be all the problem but there is that .5 drop that may get worse with heat so I'll replace that and then recheck it. Any suggestions on where to get a switch, seems like everything is made in china now so I want to be able to buy a good part. I don't want to pay more for a part thinking its better cause it costs more only to find out it's made in china just like the cheap one. thanks for the help.