What’s the purpose of these? I...

[Alumofcu]

What’s the purpose of these?  I have 2 on mysea ray 500

[wingless]

Those timers look to be aftermarket parts.

What systems work when the timer is in the on position and stop working when in the off position?

[Alumofcu]

I’ll have to check. I thought they had something to do with the inverters but after checking yesterday they aren’t connected to those, it just looks like they are. The two are connected to each other as well. They are pool/spa timers.

[gtstang462002]

If I were to guess, they are probably connected to the AC units. Probably an effort by the previous owner to save electric, but still have the boat cooled off before going back on a Friday afternoon.

[Alumofcu]

I called the manufacturer, they stated that they are used to make the shore power not use the batteries? Something like that when connected to shore power is the only time they are operational. So I would suspect they are related to the air conditioning to run it without drawing on the batteries but I would think that would be automatic no?

[gtstang462002]

Shore power is 120/240V AC. The batteries are 12 or 24V DC. Can't see how they would tie together through anything other than an inverter. Easiest thing to do is hook up a Volt meter to the inlet side and start turning off breakers until the meter reads 0 volts and the will tell you the circuit that they responsible for.