I have a 2004 Toro Z-Mower and a 2007 Exmark Z-Mower. Both mowers are the same as far as the engine goes. The are both 27 hsp Kolhers. On both of these mowers I have a Cool Top fan that I run to keep cool while cutting. I have 2 4X6 halogen lights that I use to finish up cutting if I runb out of day light. When I run the fan while the blades are enguaged it starts to drain the battery. I put a meter on the battery and the results that I get are: blades on -- 13.8 to 14 blades on & fan on -- 12.5 to 12.8 blades on & fan on & lights on -- 10.8 to 11 Question: Is there a way to get the engine to put out more voltage to the battery? ie. changing fuses etc.