I have an 89 740 gl. Was pulled over by state patrol--no brake lights. The rear deck brake light is still working but the left and right main brake lights don't. It was suggested to me to replace the brake switch. When I got in there and adjusted it a bit the deck light still comes on but the main brake lights are still not working. If the brake switch controls both the deck brake light and the main brake lights and the deck brake light works when you hit the brake pedal then it makes sense to me that the brake switch is working. Yes?
The parking lights work, the running lights work and the backup lights work. The brake light bulbs are okay. Am I right in "assuming" that current is being delivered to both rear panels correctly if all the other lights are working?
Any help? Don't want to think it's a short since it's affecting both sides. Thanks in advance! Would it do any good to replace entire light modules? I 'spect they're not cheap...

http://www.brickboard.com/FAQ/700-900/ElectricalLightingHorns.htm#BulbFailureWarningSensor


Power to the brake lights flows through the board on the bulb failure sensor. If the traces on the board are bad, which happens a lot, there can be no power to both brake lights.

REPLACE IT OR RESOLDER THE TRACES.
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Paul NW Indiana '89 744 Turbo 175K/ '90 745 turbo 145K