I think I've found my problem. I checked the trunk lid light bulb, and it was quite hot. Odd, I thought, for a 10 volt 5 second illumination, so I checked the little plunger switch that is supposed to turn off the lamp and it stayed on even when pushing on it. I surmise that this lamp has been on for the last two weeks +.

There appear to be three wires connected to it. Two appear to be "piggybacked" on the left side, another single wire is on the right. Has anyone ever taken one of these apart?

I'm quite happy to have found this simple problem. This may be my first order from PartsShop

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Robert W. Roe
1984 300SD 165,333 miles