Electrical relays
 

the car I am looking for info on is a 1991 190E 2.6 I was test relays in the external fuse box, after removing the three that sit next to each other I have lost the one to the extreme right, it looks like the six pin universal type but the guide pin is at the left side of the unit. can any one tell me the name of the unit so i can order one? thank you
Ps I thought it might be the ABS unit but when it came it was wrong.:cool:

I would take your VIN number to your closest Benz Dealer Parts Dept. He can look it up for you.
Anziani
'95 E420 129K
'97 CL500 136K

I did call them and they couuld not help.

Strange. Our Benz dealer's parts guys are great. Then give a pick-n-pull yard a shot. You can also sign up for EPC and track it down yourself.
Anziani

Here check this out..if you're talking about #4...looks like its unused.

http://i.imgur.com/B52nVipl.png

yes the R4 is the exact pin and pattern that my 190E has yet ours had a relay in it when they where taken out and so conveniently lost. I was just getting ready to ask any 190 owners to pull theres so I could get a number and order one thank you James for your help.

According to this thread it might be the OVP relay.

Fuse box layout question - Benzworld.org - Mercedes-Benz Discussion Forum

OVP relay is located behind the battery and is much too large to fit inside the fuse box.