How is the Cdrive & engine protected , if it not connected to the bonding system. With the silver anode the electrician had a reading over 1000 mv at the C-Drive, and at the strap 804. With the battery connection off, everything off it was 804 , with everything on ,still 804 . I suppose the 804 could be explain by poor zinc/bolt contact and the test being conducted in fresh water. If the engine is not grounded / bonded , how is it protected?

Thanks ,

Pat SM 123