Hey everyone, I'm new to the site (posting) and I have a small problem.  I have two problems I need help with.  I have a 2003 225 LPX fuel injected that I bought used last year.  I had no problems last year.  This year, I have a voltage issue.  Crusing I am sitting at about 11.5 or 12 volts. (this is with the exhaust closed).  When I open the exhaust the voltage drops to around 10.  I have dual batteries and have tested both of them and they are good.  I had the alternator checked at an alternator shop and it checked out good as well.  Any ideas?  Also, at idle my oil pressure is about 15 to 20.  I am not getting any alarms though.  With any throttle it jumps up to about 40-45.  Seems way to low to me.  I checked the oil and it was clean as a whistle and full.  Any help would be greatly appreciated considering I am fearing the worst with the oil pressue issue. Thanks