I got a replacement trunk lid for my son’s car and it happened to have an OEM spoiler with a brake light. It is gong on my wife’s car. Question, how does it hook up without lighting the bulb-out indicator? I know the third brake light is part of the bulb-out circuit and any load added to the existing circuit would ignite the warning bulb. One option would be to run a wire to the brake switch wire, ahead of the indicator.

Both the boot lid and the spoiler are getting a professional paint job by a hot rod builder this weekend. Material alone is going to cost $200 plus (two different colors). Luckily, labor will be much lighter.
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Tom F. Couple of Volvos Mods, RainX & cup holders.

Dear Tom F.,

Good a.m. and may this find you well. I believe the bulb failure sensor depends on the difference in amperage "draw" between pairs of bulbs. Two working bulbs -made by different firms, so with different power "draws" - can "fool" the sensor, and trigger a "bulb failure" warning.

On a US/Canada 1993 940, the third brake light is powered via a Yellow/Black wire from position 5 on the bulb failure sensor via position 18 on Connector C1. On European cars, the third light is powered by a yellow-red wire, that is "jumpered" from position 3 on Connector C1 to position 18 on Connector C1.
The Yellow-Red wire powers the right brake light.

I mention this, because it shows that an uneven loading - the wire to the right brake light supplies the power to the third brake light - does not trigger a "bulb failure" warning. There may be a resistor inside the sensor, that accounts for this uneven loading.

To draw power for the spoiler brake light, you could:
(a) jumper a wire from the position 4 on Connector C1 (from which a yellow wire runs to the left brake light)
(b) jumper a wire from the left brake light.

I'd try (b) first, because it is a shorter "run". If it triggers a "bulb" failure warning, then I'd use option (a).

Connector C1 appears to be located under the dashboard, on the driver's side (USA/Canada). Position 3 has a Yellow/Red Wire and Position 4 has a Yellow Wire.

Hope this helps to "light up your life".

With every warm, best wish for Happy Holidays and a Good, Healthy New Year, I remain,

Yours faithfully,

spook

Two choices. Run a wire to the brake light switch, or disconect the rear window lamp in favor of the spoiler lamp.

For what its worth, that is how my spoiler light is connected. I just replaced the LED light unit with a new one from www.spoilerlights.com Unfortunately, the screws were not included and I only had the one in the middle when I removed the old one.

I tracked down the existing wiring on mine and found that red is spliced into the brake light wire and black was connected to a grounding screw.
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1993 960 192K