The water taps used by Eriba are from Reich. They contain a microswitch theoretically rated for 3A. However, they are insufficient for the high starting current of the water pump. To limit this switching current, we added a 12V= relay. A relay alone would also work, but we used a module with an optocoupler.
The relay module fits into a small plastic box, complete with a switch and LED indicator. The switch can be used to completely shut off the pump.
This box is installed in the bench seat somewhere near the water tank and the water pump.
Update. We've made a second version with the same relay module but with slightly more indicators. This allows you to see the status at a glance.
Please pay attention to the wiring! The connector's illogical connections are as follows:
From the taps: To the pump:
-- Brown -- Blue
+ White + Brown
(-- to chassis / ground)
Built in near the water tank. (First version without the lid.)
Comments and questions:
GravelBiker: Why was the switch added? The pump should always run when the tap is turned on, so what's the point? Answer: When you drain the water pipes at the end of your vacation, you'd ideally want to leave the taps open in the middle position. But if you then connect the caravan to the car, the pump will still run (dry!) via the towbar connection. The switch prevents this. Hence the LED indicator on top of the little box.
Alessandrae: We also had to buy a new micro-switch, which was a hassle to replace. Conclusion 1: those switches in the Reich taps have a limited lifespan. Conclusion 2: it goes wrong at a completely inopportune moment. In short: a new switch costs 20 euros and is a hassle to replace, while a preventative relay costs less than a euro.
Dirk: Do all Eribas have those strange wire colors? Answer: No idea. Checking it yourself will give you the answer, and a multimeter is always useful.
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