In Reply to: m2 blows 20 amp fuse when ac is turned on posted by tractorjockey on June 15, 2009 at 17:30:53:
Could be one of several things. Are the clips that hold the fuse in place loose or rusty? This will build resistance and cause fuse to blow. We have moved this fuse down to an open slot below existing fuses and hooked wire to that slot to get a tighter and cleaner fuse slot. If there is nothing wrong with fuse holder then how does the cab blower sound? Smooth as silk when running and coasts to a stop. If blower seems to be making noise when running or stops right away when turned off then I would suspect blower motor to be causing extra drag and creating fuse to get hot and blow. You could try to blow fins in squirrel cage fan out as they can get built up with dirt and throw fan out of balance. Also have seen mice chew on wires in behind RH corner console and also up by blower motor. Also check ground wire for blower motor as it can also be rusty and causing extra resistance. You could also try a 30 amp fuse and then check wiring in different areas to see if you can find heat build up where the problem lies.
Good Luck, Hyper Harvest II