I searched the archives and the FAQ, but I am still a bit confused.

My problem:
All brake lights are not working. Other lights - rear turn signal, tail lights, one fog light (haven't checked the bulb on the other fog light) - all work OK.

What I tried:
1. checked the fuse - OK.
2. There is power at one of the contacts at the fuse (checked with voltmeter) while the pedal is not pressed.
2. Checked the power on the brake light switch on the pedal - no power.

My questions:

1. What is the wiring sequence for the brake lights?
Is it
a) fuse->brake pedal switch->bulb failure relay->brake lights? or
b) fuse->bulb failure relay->pedal switch->brake lights?

2. If the answer to the first question is (b), then how should I go about checking the relay? Please, don't spare the detail - I am not the most mechanically inclined person.

3. If the answer to the first question is (a) could anyone give me any suggestion on locating the wiring problem?

My car is a 1990 740GL

Thanks a bunch!

I can't answer the question about the sequence of the components in the system but I'll bet you a Guinness it is the relay. Been there done that. The relays are said to be a bit pricey; try to find a used one if you can. It is that big round red one by the way in case you weren't sure.

Randy

Should be power at both contacts with the fuse in.
When was the last time you had brake lights and what has happened since then?
Accidents?
Stereo stolen?

To answer you bulb failure question..you can check the wiring to the relay from under the fuse box...remove the ash tray retainer/fusebox cover, remove the equalizer if so equipped or the slot under the radio (I often remove the radio, makes it easier), unclip the fuse/relay box (it's really easy if you remove bøth sides of the center console but that's pretty anal ) and slide it out so you can get under it.

Or just pull the relay and replace it with a known good øne.

then start checking wires for voltage back to the lights. Or root around in the trunk and find where something broke or rubbed or got knocked loose.

Thanks for your feedback.

Clarification: there is power on one of the contacts of the brake fuse socket.

There were not any recent accidents, break-ins etc. Noone messed with the electrical system.

I just noticed yesterday that the brake lights were not working. They were working before. Could have been out a week or two.

I don't have another working relay. I did pull out and open the one I have in my car - it looked OK. There were not any visible cracks or corrosion on the soldering joints. But is it the relay? Does the power from the fuse go to the switch and then to relay or vice versa?