Small Engines (Lawn Mowers, etc.): Turf Tiger Electrical/Fuel, digital fuel injection, bridge rectifier

Question
I have a 2006 Scag Turf Tiger with the 29hp Kawasaki Engine with the Digital Fuel Injection. The first problem that I am having is the Yellow circuit fuse keeps blowing. This is the fuse that is on the bottom next the seat.  The fuse will blow both when the pto is engaged and when the mower is sitting at full throttle idle.  The full throttle idle the fuse lasts any where from 5 minutes to 30 minutes.  The fuse will only last about 15 minutes at the most with the blades engaged.  Now if the battery is charged totally from a separate charger the fuse is fine and will not blow you can run the mower all day with no problems.  Only when the battery starts to lose its charge will it start to blow the fuse again.  WHAT is the problem. The amp meter on the machine shows like 10 amps or more and but will never settle back. It will just blow the fuse. The amp meter stays pegged or 10 amp until it blows.  What is going bad or needs to be replaced. The dealer thought it might be the regulator but when we jumped the regulator from the battery to the yellow wire going into the regulator it still blew the fuse.  The second problem with the mower is that when you turn on the ignition key before start the fuel pump should kick on and prime the cylinder with fuel.  Lately it does not do this or sometime it will and sometimes it won't.  When the mower is cold or sat for a long time it seems to be worse.  But it has been hit or miss.  It you can sit there and keep clicking the key on and off.  Eventually it will cycle on and you will hear it prime the cylinder with fuel and the machine will start.  IS the two problems related.  The fuel injection relay has been replaced and it still does it.  DEALER AND ME are going nuts.  Please Help

Answer
There is a Zener diode in your system.  It is a diode that sometimes works like a regular diode and only let current run one way.  Then when needed it lets current flow both ways.  I think it is in the bridge rectifier or regulator/rectifier.  Check with the dealer and look on the schematic for the symbol. The other thing to check is to see if a wire insulation is rubbed off and momentarily shorting the circuit blowing the fuse.  Skag has an excellent electrical troubleshooting manual.  Ask the dealer to get one for you or contact Skag on your own.  Let me know.