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Uncle Aaron,
Glad to hepkats (help)!
With the change in the brake light set up from your 1985 single filament brake light to the dual filament position light / brake light, the the two +12 VDC contacts on the post 1988 (or so, not sure again the change over year) bulb holder are positionally different.
Your 1985 240 wagon tail lights:
Look at the break light bulb electrical contacts. The +12 volt contact is in the center. You can interchange this bulb for the turn signal and reverse bulbs.
Your newer 1988 and newer wagon tail lights:
Look at the break light bulb electrical contacts. The two +12 volt contacts (one of reach filament) are off center. On this dual filament bulb, you can use a 9 volt battery to know what of the +12 volt contacts connects to the 21 watt brake light filament and the 5 watt position filament.
You may have issues trying to use a 1985 240 signal filament brake light bulb holder with the dual filament contacts on the 1998+ (or so) Volvo 245 wagon tail light assembly. I'm not sure, yet you'll have alignment issues at the least preventing electrical contact (alignment) of the bulb.
You want the bulb holder fully secured into the tail light assembly. Insert and turn entirely to the stop.
You may want to use the dual filament brake light bulbs. Use a nine volt battery to figure what contact on the bulb connects to the thicker 21W brake light filament. Abstract (or transfer) the bulb contact position to the dual contact brake light holder (white for right, black for left). Abstract the brake light holder contact to the brake light contact position on the tail light assembly. Simply connect the brake light power wire to the connectors on both tail lights.
Install the dual filament bulbs, mounted to the bulb holders (white for right, black for left) that came with your newer, replacement tail lights, and power them up.
At some point when you feel up to it, you could run a jumper wire from the red running light +12 vdc contact and connect it to the position lamp filament on your revised tail light set up on your 1985 Volvo 245 wagon.
I think that does it. I could be wrong, so verify with the parts you are working with now.
Also, keep your old tail lights. Clean them up, maybe repair cracks or leaks with something like Goop adhesive (choose the Goop Marine, RV, or Automotive for UV resistance. If you find you don't need them, perhaps your could sell them to someone. I'd keep them. Volvo 240 tail lights are a real bother. Worse on the sedans as you may have read here on the bb.
Hope that helps.
Questions? Comments?
Thank you,
Buttermilk.
--
"A cold, tall glass of buttermilk with a little pepper."
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