The OVP-overvoltage protection relay is a box a little smaller than the size of a pack of smokes,and on my car at least,is located behind a panel behind the battery.It's easy to tell which one it is by the blade type fuse on the top of it.
1985 380SE- 160,000km 'Blistu' - Sold
1988 300CE- Eva,my garage mistress
2007 R350 4matic- The Black Pearl
2011 Ford Ranger-Work truck
1974 25' Trojan Sea Raider- 'Grannyknot'
2002 215 cm Atomic DH skis- Canadian SDH record holder, 175.5km/h- Vars 2010