You can measure the Resistance of the Hot-end it should be between 2-20 ohms. If you do not have a meter a cheap one is about $10 at every auto parts store.
The wire size is a big deal and many Chinese manufactures skimp on the wiring from the power cord to the 12/24 volt wiring powering the main Controller.
If you have never used one before there are many videos on you-tube explaining how to use them.