I received the following info from Sure Power when trying to help Ron diagnose a similar problem with his 2010 Chevy based Roadtrek.
If it is clicking that is a good sign of several things to check for :
(1) Bad ground connection to the ground terminal.
(2) If there is a circuit breaker installed it could be tripping.
(3) Bad or too small cable and wiring sizing. Or bad connections to any part of the terminal and wiring.
(4) If a second aux. charging source is being used such as a battery charger may not be high enough voltage to keep it engaged or if the charging source being used on the main side such as the alternator may not be reaching the 13.2 volts in order for the Separator to kick in to parallel the second battery. The battery separator must see 13.2 volts in order for it to kick in. The Separator is totally dependent on the charge source and is only good as it outs out.
(5) Or shorted cell or bad battery.
Ron kept hearing a clicking sound coming from underneath the hood coming from the Sure Power separator. The problem (as far as I know) turned out to be a failing chassis battery and the solution was the Chevy dealer replacing the chassis battery - #5 on the list above.
