fixing cigar lighter - 82 240d

Hello All,
The cigar lighter on my 82 240D hasn't worked since I bought the car 3 yrs ago, but I never needed it, so I never explored why it didn't work. Recently I realized that the darn thing wasn't hooked up, but I
can't figure out how it's supposed to be hooked up. I know that it's on the same fuse circuit as the glove-box light and the radio, and I suspect that it was disconnected when an after-market radio was installed.
I have pictures of the relevant parts, but the basic idea is that there's a brass double-pronged post on the back of the lighter that looks like a harness should slip into it. The wiring harness that's hanging loose, however, ends in a white plastic rectangular housing that wouldn't fit on the back of the lighter at all. The white plastic rectangular housing has two slots in it, one horizontal and one vertical--two red wires are passing into one slot, two brown wires are passing into the other.
Some of the spring-loaded parts of the ashtray assembly and the placement of a copper-colored piece (around the backside of the lighter socket) suggest that the circuit might be open/closed when the ashtray is open/closed, but I'm not sure if this is indeed the case.
Any advice if you have familiarity with any of this would be appreciated.
jason
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If you could post a pic, that would help. The lighter in my 80 300SD is part of the ashtray assembly. The whole ashtray and lighter pop out as a unit to dump the ashes. The lighter makes electrical connection with the housing via a slide contact on the side of the ashtray unit for +12V and the housing for ground. How it's wired behind there, I don't know. And yours could be totaly different. With a pic, someone may recognize it as being the same as theirs and could give more info.
Another option is you can add an additional lighter socket on the driver or passenger side of the tranny hump. I did that on mine because some of the plugs designed to fit the lighter wouldn't work with the geometry of the ashtray. You can get them from auto parts stores, JC Whitney, etc
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Use a voltmeter and find out which one is switched positive... meaning it only powers up when igntion is turned on... The brow wire is ground so you are going to need that .
Are you sure that white connector doesn't fit the lighter? On W126, that white connector does hook to lighter.
In any case... whether you are going to create your own connection or find the factory one... Positive is in the middle of the lighter.
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wrote:

Many thanks--i don't know how to post pics to this list, though. I've been debating about using an external socket in any case, because i suspect that the spring-loaded slide contact you describe is defunct. But i'll see if i can post some pics and keep poking around. Much appreciated.
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