I just  found this on a  V-Max  WebSight:   
I have not  checked my  bike yet  ( 89 )  to  see if this  minor  fix  applies  to  Ventures, as  well as  the  V-Max.    
Its  the  Red  wire  from output of the  Voltage Regulator  going to the Main Fuse holder  then to the  Battery   Positive Terminal.    
The  Information claims this  connecting point  is  just  " Crimped" and should  be    Soldered.  Why, because  there  is a  1  volt  voltage drop across the   crimp  connection.  At least  thats  what  is  Claimed. I can't  confirm  it  yet.     
Check this  web  address,    http://www.vmaxoutlaw.com/main.html    
   On  left of page  click on   v max  tech + Info:   
   Then  Scroll down  to  and find,   " Crimp"  connection fix.    
    It  gives   Schematic  information,  and  some  good  photographs as to  
 how  to  do the   "  fix "   The  Fuse holder  looks same as on 1st Gens.     
    I  will check mine  tomorrow,  or  as  time  presents itself,  being  that  I  am  now   Retired,   Time  is  in  fairly  short  Supply.  And its  January and its  Cold  in the  Garage,   and  I just  got home with a  6 pack !!