12v MR16 LED downlight problem

[leeco]

I'm having a problem with some 12v LED spots im trying to fit in a boat on a 12v system. In one of the rooms that I am fitting the lights when I switch them on only one out of the 4 comes on then when I switch the switch again maybe 2 come on and so on sometimes they all might come on. The strange thing is if I get one thats on and move it close to the other lights they also come on but you have to nearly touch each light.

Any Idea what is wrong? Do I need some kind of driver like you do when installing them on a 240v system.

 

[PrenticeBoyofDerry]

What make/model are they.
How did you connect the string up?
Sounds like either poor connections or voltage drop issues!

 

[leeco]

What make/model are they.
How did you connect the string up?
Sounds like either poor connections or voltage drop issues!

These ones.

http://www.ebay.co.uk/itm/MR16-12V-...04?pt=UK_Light_Bulbs&var=&hash=item7218717ea0

I have a 10mm2 wire coming down the boat from the batterys and have linked of the wire to my switch and sent the wire 1mm2 to the lights but not too far apart.

 

[ericmark]

LED's are normally around 1.2 volt so there must be something in the lamp to drop the voltage from 12v there are two things that come to mind.
1) Will it work with DC
2) Will it work with 11.8 to 14.8 volt from a lead acid battery which is also being charged with a step battery charger.
For the tungsten lamps there is a special version for caravans and boats they are not as used in a house.

It does warn to use consent current driver not a consent voltage I have used voltage regulators to do this in the past but will need over 12 volt to use them.

I would guess there is a rectifier built into the lamp and it may be powering only every half cycle with DC this will not be the case.

 

[ban-all-sheds]

I have a 10mm2 wire coming down the boat from the batterys and have linked of the wire to my switch and sent the wire 1mm2 to the lights.

What fusing have you got where?

but not too far apart

What are the voltages at each light?