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

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

by in Youngstown, NY on January 20, 2013
Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
2 answers 1 comment
ANSWER by , October 25, 2013
I have had the same problem with a key
ANSWER by , January 20, 2013
spray it down with an antirust to help break down the corrosion. roy
COMMENT by , January 20, 2013
conector have plastic body,hove to oppen it