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Wiring of 12 volt water pump.

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THUB

Member Since: 10 Dec 2005
Location: West Berkshire.
Posts: 717

2012 Discovery 4 TDV6 HSE Auto Nara Bronze

Wiring of 12 volt water pump.

I have had to replace the Shurflo water pump in my caravan. A perfectly straight forward job so I thought. Old pump out, new pump in. However when undoing the (household type) connectors there was a "U" shaped wire link looped between wires i.e. black and red. The link has a little black cylinder in the middle. The cylinder has a small silver mark at one end, but I have no idea what it is. It came out with the two wires and I have no idea which way to put it back. Is there a flow direction that is important? I suspect that it is there to supress radio intereference from the pump. Any help please.l

25th Jan 2012 5:10 pm

wiggs

Member Since: 03 Sep 2006
Location: Manchester
Posts: 14372

2015 Discovery 4 3.0 SDV6 HSE Auto Fuji White

proberly a Diode ...its there to stop you putting power the wrong way to the pump G4 Gone ...but not forgotten

25th Jan 2012 5:19 pm

THUB

Member Since: 10 Dec 2005
Location: West Berkshire.
Posts: 717

Thanks Wiggs. Is there a right or wrong way to replace the Diode if that is what it is?

25th Jan 2012 8:26 pm

NickJ

Member Since: 11 Oct 2010
Location: there's no f in point
Posts: 2137

2006 Discovery 3 TDV6 S Auto Zambezi Silver

Is the silver mark a ring around the entire circumference of the component? If it is a diode then this denotes the cathode (-ve) and if you were to connect this side to the negative supply and the other to positive then you'd get current flow and therefore a dead short (i.e. not what you want). That's if it's wired in parallel across the connections. If it was in series that would be different... could you post a picture of said component?

25th Jan 2012 9:01 pm

wiggs

Member Since: 03 Sep 2006
Location: Manchester
Posts: 14372

Basic info for you

The most common function of a diode is to allow an electric current to pass in one direction (called the diode's forward direction), while blocking current in the opposite direction (the reverse direction). Thus, the diode can be thought of as an electronic version of a check valve.

As said a piccy would help

G4 Gone ...but not forgotten

25th Jan 2012 9:11 pm

THUB

Member Since: 10 Dec 2005
Location: West Berkshire.
Posts: 717

Yes there is a silver ring completely around the diode. All I can add is that there are 2 wires +ve and -ve to the domestic type connectors and then 2 wires running to the pump. Also +ve and -ve. I have wired up without the diode and the pump runs fine. I have absolutely no idea how to post a picture on the site. Is the anyway I can test the flow through the diode. I did speak to the caravan manufacturer but the compamy has changed hands and they no longer fit the diode.
On the black body of the diode are the letters 1N5401 and underneath G04:

25th Jan 2012 10:19 pm

wiggs

Member Since: 03 Sep 2006
Location: Manchester
Posts: 14372

The letters do show it as a diode ..

It should only flow voltage one way .. So quite easy to test . G4 Gone ...but not forgotten

25th Jan 2012 10:33 pm

woody32
Site Sponsor

Member Since: 11 Mar 2009
Location: Somerset
Posts: 3551

The diode goes silver strip to the positive side of the wire and the other side of the wire so links over to your earth side this will be at the connector end where it plugs into the pump its a way of dumping voltage quicker when you turn the pump off but will work fine without it fitted

a bit like this http://www.google.co.uk/url?source=imgland...rod1MeYtMQ

I hope

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26th Jan 2012 1:16 am

THUB

Member Since: 10 Dec 2005
Location: West Berkshire.
Posts: 717

Thanks for the advice and replies. All sorted and running fine. Much appreciated.

26th Jan 2012 10:41 am

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