No brake lights

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mcgsxr
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No brake lights

Post by mcgsxr » Tue Apr 10, 2012 3:27 pm

I had started asking questions about this in my thread about reverse lights, but figured a new thread was in order.

I have reviewed the info about the earlier Birds in diagnosing this problem. It is a good primer I figure.

I know that my fuses are OK. I have verified that the brake light switch works (tested with a multimeter both open and closed, with 12v present when appropriate).

I went looking for the flasher unit referenced in the Flairbird docs, but don't see it in the trunk.

I have pulled the spare out of the trunk, but don't see anything like what the earlier cars have back there.

Pics below.

How do I continue to test now? I figure the big black box is the sequential flasher unit for a 1969.

Image

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Rehomed - 1969 Red Landau Tudor survivor, 34K original miles. TBird Registry #37047

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redstangbob
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Post by redstangbob » Tue Apr 10, 2012 4:05 pm

I figure the big black box is the sequential flasher unit for a 1969.
Sounds like it to me. Here's a page from cougars unlimited ebay store, the 69-71 section is near the bottom. Looks like the green wire is still used from the brake switch, test it. Sorry I can't help more, I don't have those schematics.
http://stores.ebay.com/BARGANSPOT/1965- ... oting.html
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mcgsxr
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Post by mcgsxr » Tue Apr 10, 2012 5:45 pm

Thanks for that link.

In reviewing it, there is a flasher relay, it is somewhere up under the dash.

Ugh, back on my back under the front!

Then, into the trunk again!
Rehomed - 1969 Red Landau Tudor survivor, 34K original miles. TBird Registry #37047

tbird
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Post by tbird » Tue Apr 10, 2012 11:57 pm

That black box is a replacement for some of the electro mechanical that was used up until 66 I believe I have a new one.
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mcgsxr
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Post by mcgsxr » Thu Apr 12, 2012 12:42 pm

The brake light switch at the pedal works.

I have power at 3 wires in and out of the black flasher box.

On to the tail lights I guess.

Could all 6 bulbs have malfunctioned?
Rehomed - 1969 Red Landau Tudor survivor, 34K original miles. TBird Registry #37047

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Post by redstangbob » Thu Apr 12, 2012 1:00 pm

Earlier you said the turn lights all worked, the same filament in the bulb is used for stop and turn so it's not the bulbs. :???:
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mcgsxr
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Post by mcgsxr » Thu Apr 12, 2012 1:03 pm

I have double checked that all the rear signals do work (all 6 bulbs sequence and light as they should), when just using the turn signals. The brake lights don't work regardless if the signals are on or off.

I will have to spend more time with the flasher unit, and figure which wires are which.

I am having trouble sorting out which 3 wires should have power in and out of the black box - I have different colour combinations than what is listed in the link, but there is power to 3 of them at both connections with the brake pedal wedged down.

It may be that the signal switch in the column is bad, but seems odd that the signals would all work if that was the case.

Fun fun!
Rehomed - 1969 Red Landau Tudor survivor, 34K original miles. TBird Registry #37047

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redstangbob
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Post by redstangbob » Fri Apr 13, 2012 4:02 pm

Actually in a car without sequentials, the brake lights do go through the turn signal switch, maybe yours does too. See if you can unplug or back probe the T/S switch and find brake light current with the pedal pushed. It won't hurt to look.
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mcgsxr
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Post by mcgsxr » Fri Apr 13, 2012 5:54 pm

I may have to dive into the column, but I fear it.

The fact that I have power on 3 wires in the trunk - does that not mean we can rule out the pieces that come before it?

I don't have emergency flashers functional either, does anyone know if this is related, or if there is a flasher unit specific to the 4 ways I can test?

Thanks,

Mark
Rehomed - 1969 Red Landau Tudor survivor, 34K original miles. TBird Registry #37047

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mcgsxr
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Post by mcgsxr » Sat Apr 14, 2012 11:17 am

Heeding some good advice, I have ordered up the wiring diagram for the car (and the vacuum diagrams for future use), and will wait for those for the final analysis.

Early stage thinking though, is that it may indeed be the column mounted turn signal switch.
Rehomed - 1969 Red Landau Tudor survivor, 34K original miles. TBird Registry #37047

tbird5866
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no brake lights

Post by tbird5866 » Sat Apr 14, 2012 11:55 am

I would be looking at (or for) the brake light relay. Maybe under the hood, Let me look in the Ford Parts Book!

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mcgsxr
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Post by mcgsxr » Sat Apr 14, 2012 12:39 pm

I don't think the 1969 has a brake light relay. I could be quite wrong though!
Rehomed - 1969 Red Landau Tudor survivor, 34K original miles. TBird Registry #37047

tbird5866
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no brake lights

Post by tbird5866 » Sat Apr 14, 2012 3:07 pm

Of course, you may be right, but with all those bulbs lighting up the rear of your car, I would expect a relay in the brake light system..

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mcgsxr
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Post by mcgsxr » Sun Apr 15, 2012 2:04 pm

Trust me, all ideas are genuinely appreciated, so if you do come across any documentation that one exists, with any idea of where in the car it may be, I am glad to add it to my list of things to test.

A friend of mine suggested that since there is no power on the green/red striped wire at the brake pedal - I should test it by bringing power to that connection.

I am not that familiar with testing electronics - where under the dash can I tap into power, or do I need to run a long temp wire off the + of the battery?

His thought is that if I apply power to that wire, I should then have brake lights, and then I will know that it is the column switch that is gone.
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Post by redstangbob » Sun Apr 15, 2012 2:15 pm

The brake light switch at the pedal works.
I took that to mean that you tested, and had power in and out of the brake switch? A test light is your friend here, one of the switch wires should be hot, and with the pedal pushed they both should be. If you need to run a jumper wire for testing, the fuse box will have someplace to tap into, find it with your test light. Hope that helps, Bob C
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