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On 240 sedan and 242 coupes with the flexi-circuit boards on the later six-panel wrap-around tail lights, you have four variances in two groups.
We have a single variance, described below.
Originally:
Variance 1 - the tail light had a single-filament bulb for the lower, outer brake light.
Variance 2 - The bulb holder bayonette mount is unique to the single-filament tail light assembly.
These single-filament sedan and coupe 240 tail lights were mostly made by Hella. These are wholly and vastly superior to the stupid and frail Valeo sedan tail lights on 240.
In and around 1987-1988, we have the dual filament wrap around tail lights. I think these were made by both Hella and later, and more numerous, crappy Valeo.
Variance 1: the tail light had a dual-filament bulb for the lower, outer brake light. The flexi-circuit board supports this.
Variance 2 - The bulb holder bayonette mount is unique to the dual-filament tail light assembly.
I think three different companies made the flexi-circuit boards for all production runs.
Though what you find, again, unless I'm wrong and I ask you folks to correct me here, from after market vendors supports the later dual-filament brake light bulbs in the lower, outer red panel.
Finally, the interface between the wire harness connector and the flexi-circuit board is different. The wire harness conductor positions are different. How these are, I dunno. Art B, lucid, porkface, and others may know instantly.
What usually happens is you buy a replaceemnt flex board that supports the dual-dilament brake light-running light combo, yet you connect the 240 wire harness wired to support a single filament brake light.
If you do not blow a fuse, the brake light filament lights when you turn on exterior lighting (running lights and head lights).
I'm uncertain whether you can find a suitable flexi circuit board for your 1984 240 sedan six-panel wrap around tail lights.
On the iPd page here:
http://www.ipdusa.com/prodtype.asp?numRecordPosition=49&CAT_ID=970&categorycrumbs=1053,970
iPd list only the dual-brake light filament flexi cicuit boards.
As I have futz with these ridiculous Volvo 240 tail lights, I know how to modify a tail light assembly to suit the application. To write how to do this would take a very long time. No matter the direction, going from a single brake light filament or dual brake light filament no matter the tail light housing and 240 wire harness to support it.
Give me a week, and may be able to and post on the board. I have some Estonian-made Volvo 240 tail lights I need to reassembly with good adhesive sealant and proper reflective paint. I also have 1982-85 Hella sedan tail lights, or one, on my 1992 240 GL. The 1982 Hella red is redder than the stupid, frail, 1992 Valeos.
So, if are good with electromechanical causality, you may be able to suit all of it to your needs.
Finally, on dual-filament brake light 240 flexi-board, the white dual filament brake light bulb holder goes to the RIGHT side. The black to the left.
Many people reverse these, and melt the cheap Valeo red lens. Or it cracks. Or the black stupid ABS housing cracks, and leaks, and thing fail slowly, thereafter.
Else, I leave you with my fave image I uploaded right here on your beloved Brickboard.com!
cheers,
Buttermilk MacDuff.
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