voltage meter help

[jaygpoo]

Hi gang, I am building a power box and have installed a leaisure battery and 5 lighter sockets + a USB socket. I brought a LED voltage meter from the internet and its arrived but it has 3 wires . RED/ BLACK/ YELLOW. How do I wire that into my setup, as if I attach the red and black wires to the battery I had expected a reading of 12 volts but I get 0 . What is the yellow wire (earth? ) I have of course wired all sockets etc in parallel.

[alanjgreen]

Can you post a link to the item that you purchased?

 

[Jonk]

Can you post an image of this meter?

It's possible that it's not what you think it is.

A small but useful multimeter ca be bought for a round a fiver.

[Jonk]

Thinking about is in one of these?

http://www.ebay.co.uk/itm/DC-0-100V-Blue-LED-Digital-Voltmeter-Voltage-Gauge-Panel-Meter-Car-Motorcycle-/152010301902?hash=item23648521ce:g:~~MAAOSwzJ5Xc4Q6

if so, the red and black provide power to the meter, the yellow normally goes on +ve to read the voltage.

[Davey-T]

For a few more pence you can get a same sized combined volt / amp meter which is quite useful.

Dave 

 

[jaygpoo]

I have not yet found how you post the internet links but here is a screen shot of the item I have to wire in

[BXRO]

Hi jaypoo

The black is your common (-), the red is your supply (+) and the yellow is your sense or input. Connect your black wire to the negative and your red wire to your positive (5 to 30 volts) and the display should come on with it showing 00.0. Now connect the yellow wire to your red and you should get your supply voltage

 

Hope that helps

[faulksy]

red/yellow + black - the reason. black is earth and 2 colours, 1 for the display and 1 for the actual reading

[jaygpoo]

Great . Many thanks to the ones of knowkedge. All sorted and working. ROLL ON CLEAR SKIES . Have a great xmas and new year.  Jay