I believe I have short on one of the ground/earthing wires for my Skoda Octavia MK2 . When the atmosphere is moist/humid or just rain it’s difficult to start or doesn’t start at all . When it does start a lot of the electronics don’t work or are haywire. Does anyone know where I can get the diagrams for the ground wires so I can check and replace them ? Thanks 

It's common for wires to corroded along the chassis leg under/behind the air filter housing and fuse box. Also seen main earth to the gearbox completely broken or defective causing high resistance too.

Edited 25 July, 20241 yr by Blue8793841

Thank you I will check those locations and give an update . 

It's not really an easy ting to check, could be hundreds of wires around that area. Are you sure battery health is good and no stored codes in any computers?