The info is from another thread but has morphed into this question. There has been no response to my recent questions on the other thread so I hope I am not being impolite by re-asking the questions another way.

My car is a 1989 300E and a local shop recently installed euro headlights and wipers. To engage the newly installed euro wipers, the shop blew the fuse #3 fuse rated at 8A. They could not understand why the fuse blew but tried a 16A fuse instead and the headlights and headlight wiper motors all work correctly.

But the continued operation with a larger fuse has me worried. If the headlight wipers only work with a larger fuse - does this indicate a damaged relay? Or perhaps the wiper motors are too old/worn? I am worried that the larger fuse will not protect some vital and expensive electronics.

Your comments will be appreciated as I really have no idea what risks I have with this larger fuse in place.

Many thanks,
Paul