Re: Advice on fixing stop lights 740 GL
"James Sweet" <firstname.lastname@example.org> wrote in message
> "Geronimo" <email@example.com> wrote in message
>> It is an 89 740 GL. I got a haynes manual that has a diagram
>> (although the last year shown is only 87). Ha! European diagrams make
>> little sense! Anyway, the fuse is good. THe brake light in the rear
>> window works fine, but the left and right main brake lights do not
>> work. Actually they are intermittent, or were.... now they are inop
>> all the time it seems, and the "bulb out" indicator is illuminated on
>> the inst. panel. I see that the right and left brake lights branch at
>> the bulb failure sensor. (Could not see where the rear window brake
>> light branches off, unfortunately.) Seems like the bulb failure
>> sensor is the thing to check next, could be a loose connector? But
>> where is this module located? Don't have a clue.
>> I checked the bulbs, connectors, and wire harness in the trunk, it
>> all seems OK, nothing obvious.
>> If I could get into the harness near the rear window brake light, I
>> wold just run a new wire to the main brake lights, but I don't see how
>> you get to it. Thanks.
> The most likely culprit at this point is the bulb failure sensor, it's a
> round can plugged into the relay tray. If you pop it open you'll see two
> circuit boards stacked, and probably some cracked soldering. Heat up the
> solder joints and flow a bit of new rosin core solder into any that look
> suspect and you should be good to go. If you or someone you doesn't know
> to solder, you can replace the sensor but you should at least look inside
> verify the problem.
I was going to suggest the same thing James. But, I'll add that the red
"can" relay is a pricey item new. There are often relay sets on eBay for a
fraction of the cost of new.