Failure to use the electric car electric car fault diagnosis are the following nine directions: 1) vehicle without electricity electric tricycle top ten brands, how to check the first check there is no electricity supply, if not then to see if the fuse is good, if the fuse? normal, no power supply, check the power of the internal electrode wire is loose, the battery is disconnected. If the power supply, check the power cord and power locks are normal. 2) an electric vehicle, the motor does not turn how to check? Will be transferred to the positive turn red and yellow lines shorted the speed controller, if the motor is operating normally, the motor and the controller is good, if the motor does not turn, then Motor bad or worse if the motor controller and the controller is normal, the motor does not turn, it may be transferred to the brake handle problems. Electric car fault diagnosis are the following nine direction: 5) How to detect brake handle 20 volts with a multimeter range measuring electric tricycle controller nine-pin plug, black pen means thin black line refers to thin purple line red pen? Shandong electric tricycle manufacturers, voltage display for about 6 volts, zero is always off the brake, brake handle grip at the price of electric tricycle Which is cheaper, then the multimeter should show zero voltage constant uninterrupted power to the brake. 6) How to Detect A brushless controller power tube damage detection:? Power Tube bad performance of the vehicle does not turn or phase, specific measurement methods: measuring diode controller files A, B, C three-phase motor wiring multimeter black pen then power red, red pen, respectively, then the three-phase motor phases, multimeter significant value should be around 500-600, if a test result is zero or very small relative to the display, the phase of the power transistor breakdown If the show is a great circuit; multimeter red pen then the power ground, black pen, respectively, then the three-phase motor phases, multimeter display value should be around 500-600, if the display is zero or very small, the phase power MOSFET breakdown, if a great show for the power tube B in case of a power interruption conduction with a multimeter voltage profile measurement controller nine core plugs Thin Red Line and thin black lines, to see whether the voltage of about 5 volts, if not voltage controller bad. Electric tricycle join, electric tricycle, White Dragon, White Dragon machinery provided by Shandong Machinery Limited. White Dragon Shandong Machinery Co., Ltd. (www.bailonggrp.com) strong, credible, Shandong Linyi bicycles, tricycles and accessories industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the White Dragon machinery and you hand into the brilliant, for a better future!