Am I able to check electronic systems without engine?

Am I able to check the electronic system without the engine in the chassis? I got told that if I wrap up all the mounts and connections to the engine and make sure they're not touching that I can do so. I'm just double-checking. 
 I have a kz250G LTD 1981 
 

It is potentially possible if you are careful but largely pointless. To test electrical circuits properly they need to be all plugged in and powered up