cigarette lighter (1 Viewer)

[Spade]

Hi lads
Any chance of a bit of help
I am trying to change the cigarette lighter socket on my ducato (year 2000) to a lockable type
http://www.ebay.ie/itm/231322095149?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
There are three wires in the original fitting-purple,red/blue and yellow.
the new socket has just positive and negative only.
I checked the connections on the old socket wit a continuity tester and it seems that the red/blue is positive and the yellow is negative.I don't know about the purple wire.
I connected the red/blue to positive and yellow to negative but no luck.
I then connected purple positive and yellow negative but again no luck.
Where am i going wrong?
why is there 3 wires instead of two.
i have checked the fuse.it is fine

 

[old-mo]

Think you will find one is for illumination when your light`s or ignition is on... most cig lighters have a small bulb strapped to the side... some how..

 

[RichardB]

I seem to remember when I changed my cig lighter it had 3 wires
There was a negative and two positives. One was a feed to the positive of the socket and the other was a positive that was switched with the side/headlights which lit a bulb in the cig igther socket so you can see if at night. I just connected the negative and the positive that ran from the fuse board and not the one that was switch with lights.

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[Techno]

Hi lads
Any chance of a bit of help
I am trying to change the cigarette lighter socket on my ducato (year 2000) to a lockable type
http://www.ebay.ie/itm/231322095149?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
There are three wires in the original fitting-purple,red/blue and yellow.
the new socket has just positive and negative only.
I checked the connections on the old socket wit a continuity tester and it seems that the red/blue is positive and the yellow is negative.I don't know about the purple wire.
I connected the red/blue to positive and yellow to negative but no luck.
I then connected purple positive and yellow negative but again no luck.
Where am i going wrong?
why is there 3 wires instead of two.
i have checked the fuse.it is fine

As said one is purely illumination. Have you tested with the IGNITION ON!

 

[Spade]

thanks lads
did not think of the light for illumination
the lighter circuit is live even when there is no keys in the ignition.
the radio is the same.
i assume a previous owner rewired it, so as to have radio and power even with no keys.
it makes it harder to diagnose .
thankfully i did not cut off the fiat connector.
i just used male spade connectorsat one end and female at the other
the original socket was damaged when i removed it. but i have kind of got it back in shape
maybe the new socket is not working