2003 Mercedes-Benz E500 Q&A

2003 Mercedes-Benz E500 Question: no start due corroded battery harness,how to disconect it on the junction point

I have strong battery and can not start car .this problem occured a six months ago,mechanic have fixed it but ,it happened again. please give me advice how to disconect junction point ,and not break it miroslav -
Answer 1
spray it down with an antirust to help break down the corrosion. roy -
Comment 1
conector have plastic body,hove to oppen it -
Answer 2
I have had the same problem with a key -