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Old 14-10-2008, 09:26   #1
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12 volt timer?

Does anyone have a source of a 12 volt timer?
I am looking for a timer that can be set to turn on for 1/2 hour, and off after 1/2 hour, continouslly.
It's for an old 12 volt frige unit that won't shut off. A new thermostat didn't cure it.
Any source?
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Old 14-10-2008, 09:50   #2
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here you go. 12V timer switch 2 circuit clock relay

You'll need a high current version, hence the price. OR, if you're electron savey and can solder one can be made from parts from Radio Shack. It's basically a 12v relay with contacts that can handle the refig's current draw controlled by a 555 timer IC. The internet has a billion examples of 555 timer circuits you can copy.

good luck
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Old 14-10-2008, 11:35   #3
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12VDC Timer c/w Internal Relay (16A switching): < $70
TS-08/24-Hour Programmable Time Switch--6-24 VDC or AC.

It might be cheaper (and certainly "better") to repair the fridge (thermostat &/or relay).
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Old 14-10-2008, 15:01   #4
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OK, I'm scratching my head here. If you have a new thermostat, and IT WORKS, how could your system continue running, when the thermostat cuts off power to it? That makes no sense...
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Old 14-10-2008, 18:04   #5
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We don't understand it either. My friends that have the boat, are visiting, and their boat is on the West Coast.
To me it sounds like the thermostat is bad, But he put in a new one.
With the thermostat hooked up, it will start up and run a while. Then it will cycle off. But when it tries to start it tries 3 times and goes into a wait mode.
By bypassing the thermostat, and connecting the wires, it starts. When tou disconnect the wires it stops, and will restart, when reconnected.
I think the new thermostat is bad.
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