Got the info from Merecedes Shop Forums ( http://www.mercedesshop.com ). Turns out the FUSE (blue 15A) atop the OVP was all that was bad.
On a 300CE, the OVP is located under the black plastic cover behind the battery. The OVP is a beige-colored relay with a clear plastic flip top fuse cover.
Picture of my OVP below
