Yes, the switch operates a solenoid valve between the reservoir and engine water inlet hose; I'm not certain it's entirely gravity feed, when water is flowing in the hose it will tend to cause some suction on the neutrasalt inlet.
From what I saw when I installed it in my previous boat and the current installation made on my 2004 boat in 2005, apart from a faulty solenoid/ valve, things that might be wrong;
Electrical;
Power to switch ? (standard harness has a fuse)
Power getting from from switch to solenoid?
Other side of solenoid is connected to -ve somewhere, is that OK?
Mechanical
Vent in reservoir cap blocked?
The later Neutrasalt systems have a check valve in the line; if yours has, it it blocked?
Has it ever worked? If not, is the check valve fitted the correct way around?!
It might of course just be the solenoid valve; if so, I'm sorry I have no idea where to get one from apart from VP.
Some general advice for anyone fitting Neutrasalt, keep an eye on the Neutrasalt level; my original one had a solenoid valve that didn't shut off completely; an expensive discovery when i found all the Neutrasalt solution had gone and was all over my house drive ( as unit was out of warrranty, I fitted a small ball valve in line.)
I can check the standard wiring colours for you in a couple of hours if that's any help.
Regards,
Graham
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