saver is to be used by itself then the unit will correctly operate either direction, however if the monitoring system is fitted ( see below ) it is important to correctly mount the unit ). Before connecting the Zinc saver in line on the A.C. green wire, visually check visually or with a continuity meter to make sure there is no other path for the A/C green wire to reach the bonding system on the shore side of the zinc saver.( some one may have put a sneaky cable which is not obvious ) . After installation to verify that there is no ground loop around the zinc saver , disconnect one side of the zinc saver and with your test meter place one probe on the wire which is disconnected and place the other probe on the other wire, there should be no continuity.

Testing Your Zinc Saver.
Disconnect the shore power. With your digital multi meter on DIODE CHECK- read across the input and output of your zinc saver. Readings will be about 900/1000 ( depending on the meter ) . swap the probes over to the opposite way , readings should be the same ( plus or minus 10% ). If you get full continuity ( 000 ) Disconnect one wire from the zinc saver and read again. If it reads full continuity ( on the wire ) then your green wire ground is incorrectly wired by-passing your zinc saver. A zinc saver is simple to fit, however it involves working on the 230 v A/C/ input, if you have any worries about doing this then please contact a qualified electrician. Disconnect the boat from shore power, and ensure all sockets are dead before attempting to install this or any other device on the a/c system (This takes a few minuets as the new internal capacitor must charge and discharge) You must find this problem and fix it.