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Hi Sparro,
Do you mean the wire harness connector that secures to the tail light assembly. Two barbed clips, part of the black tail light plastic, that are on either side of the white wire harness connector to secure the connector into place, correct?
We're talking sedan tail light on your 1991 Volvo 240, yes? Not a wagon?
I dunno if this helps:
http://cleanflametrap.com/tony/tail_light_color_code_v0.htm
The white wire harness connector can open up wider over time. I dunno if the plastic body opens up as it hangs on the tail light. I used pliers to crimp the white connectors closed somewhat so they clamp onto the tail light assembly wire flexi-circuit board connector that folds over the horizontal flat protrusion molded as part of the black plastic tail light reflector body (i dunno what to call it).
Before crimping it, I also use an old toothbrush to clean the contacts inside the white wire harness connector.
Yes, as silvermine dielectric grease helps slow corrosion. At the connector and where the bulb holder contact touch the flexi circuit board. Just don't get the grease on the bulb or inside the reflector area, if you can.
Certainly where the bulb holder contact the bare copper contacts on the flex circuit board. It could help to inspect the flexi circuit boards for corrosion.
And remember, as I believe we're discussing 1991 Volvo 240 sedan (not wagon) tail lights, you have two distinct bulb holders that fit into the tail light assemblies for the brake lights. The bulb holders hold bulb number 1157. 1127 is a dual-filament bulb. One for parking, or position lights. One for the brake light. The dual-filament bulb holder are distinct in that the white dual filament brake light bulb holder installs in to the right (as you sit in the 240) tail light, and the black one to the left.
Check your Volvo 240 owner manual. It's in there.
I've seen people reverse the dual-filament brake light bulb holders. The red lenses melted or cracked from the heat or the brake light bulb on all the time when the lights are on. (Maybe the right, as you sit in the car, side melts?)
On wagon 240s, they are the same left to right for dual filament brake light bulb holders in the tail light assemblies.
Questions?
Hope that helps.
Rainy Day MacDuffy's Tavern
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