When your lawn tractor can't start, it clicks when you turn the key or do nothing, and you can assume there is a problem with the battery.The lawn tractor's battery usually runs out of power after sitting for a long time, but it also runs out of power in a short period of time.You can test the lawn tractor battery in several safe ways to see if it is good and if it can be charged.Find the battery on your lawn tractor.They are usually under the seat of the lawn tractor or behind the engine under the hood.Scrape off any debris or corrosion at the top of the battery with a flat head screwdriver.Find out what type of battery it is.Next to the battery brand name is the battery voltage.Most lawn tractor batteries are 6-But some are 12 volts.volt batteries.Turn the multimeter on to the 6 v or 12 v setting on the dial.Touch the red probe from the multimeter to the positive pole on the battery.Touch the Black probe from the multimeter to the negative pole on the battery.It should read several decimal places below 6 v or 12 v.If the voltage is correct, please proceed to the next step.If not, then the battery needs to be charged with a suitable 6 v or 12 v battery charger.Screw down the battery cable with pliers and scrape off any corrosion on the battery pillar with a screwdriver.Once completed, tighten the cable back to the battery.Use a flat head screwdriver to pry the top of the battery from the top of the battery.Check the battery to make sure there is water on the top of each metal plate inside the battery.Without enough water, the battery will not be able to remain charged.Fill each battery to a metal plate with distilled water.Find the fuse installed next to the battery.Because the price of the fuse is only a few cents, unplug the fuse and replace the fuse.The fuse is easy to burn and is the reason why the mower cannot start.