Adding a 3rd Brake Light to a '67 - Page 2 - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

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post #16 of 92 (permalink) Old Jan 2nd, 19, 2:33 PM Thread Starter
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Re: Adding a 3rd Brake Light to a '67

Thanks, Jeff.
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post #17 of 92 (permalink) Old Jan 2nd, 19, 2:40 PM
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Re: Adding a 3rd Brake Light to a '67

I am planning on adding a LED strip style to the top of my window. I also plan to use a converter so no turn signal blink.




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post #18 of 92 (permalink) Old Jan 2nd, 19, 2:57 PM Thread Starter
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Re: Adding a 3rd Brake Light to a '67

I was thinking about the LED strip. Prices of strips from China were all over the place on ebay. They were anywhere from $12 to $67 for the same thing, same ad just different sellers. I decided on the GM light because I thought it would look more factory-like. I'll use this instead of running wires up to the brake light switch.

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post #19 of 92 (permalink) Old Jan 2nd, 19, 3:38 PM
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Re: Adding a 3rd Brake Light to a '67

I added the LED strip from a 90's Chevy SUV, van, and others, and wired it to the brake light switch. I cut the strip above the rear window and inserted it into the back of the car so that it is pretty much non-noticeable. I think I was able to attach pictures, and here's a video of it (I was testing the brake lights, but you see the 3rd CHMSL as well.
https://bradwaller.com/wp-content/up...7-20-14-PM.mov
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post #20 of 92 (permalink) Old Jan 2nd, 19, 9:58 PM
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Re: Adding a 3rd Brake Light to a '67

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Originally Posted by Rickles View Post
Did you wire it directly to the brake light switch, then?

I haven't done this yet but I'm certain the Waldochlogic and the other Pacer Performance thing won't work.


With three wires, it's just two diodes. If it really was a logic circuit, it would need power and a ground in addition to the flashed inputs. A diode is a one way valve, if there's voltage on the input side, it'll pass it to the output side, even if it's going on & off every second. If you're NOT stepping on the brake pedal but you have your turn signal on, it'll pass voltage and it's output to the third brake light will flash.


I don't see any way to do this without running a wire from the brake light switch.
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post #21 of 92 (permalink) Old Jan 3rd, 19, 8:42 PM Thread Starter
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Re: Adding a 3rd Brake Light to a '67

Do you just splice into one of the wires at the brake light switch, and, if so, what color wire? I don't have the car to check with a test light.

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post #22 of 92 (permalink) Old Jan 3rd, 19, 9:47 PM
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Re: Adding a 3rd Brake Light to a '67

was just thinking about doing this last night trying to come up with a clear way without getting into headliner.

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post #23 of 92 (permalink) Old Jan 4th, 19, 12:23 AM
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Re: Adding a 3rd Brake Light to a '67

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Do you just splice into one of the wires at the brake light switch, and, if so, what color wire? I don't have the car to check with a test light..

Yes. The wire that's dead. When you step on the brakes, the dead wire becomes hot.


I'm not sure how it is on a '67 car but 1970~1972, orange is the hot from the fuse box and white is dead and feeds the lights through the turn signal switch. If the colors are the same, you'd want to splice into the white but test it first.

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post #24 of 92 (permalink) Old Jan 4th, 19, 9:53 AM Thread Starter
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Re: Adding a 3rd Brake Light to a '67

Thanks, Paul.

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post #25 of 92 (permalink) Old Jan 4th, 19, 11:19 AM
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Re: Adding a 3rd Brake Light to a '67

If nothing else ... change the tail lights and parking lights to LED ....
Iím considering this one, but agree itís too low, but better than nothing....
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post #26 of 92 (permalink) Old Jan 5th, 19, 10:21 PM
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Re: Adding a 3rd Brake Light to a '67

I just received this neat little LED strip (six of them, actually). It's weatherproof and has an adhesive back. Inexpensive!

https://www.ebay.com/itm/6X-Waterpro...t/272109460788

I'm gonna make up some sort of angled bracket with a strip magnet on the bottom. I'll place it on the body between the trunk and the rear window bottom edge. I'll make the angle so it holds the strip facing rearwards standing straight up. I'll have a plug in the trunk so it'll be removable. I'm also considering one above the license plate somehow.

I'll power one up tomorrow and post it's brightness.
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post #27 of 92 (permalink) Old Jan 12th, 19, 8:40 PM Thread Starter
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Re: Adding a 3rd Brake Light to a '67

I talked to one of the tech guys at American Technology Components, the company that makes the brake light thingie. He said wires splice into Pos. leads for the Lt, Cn, and Rt brake lights; it doesn't need to be grounded. It works by both L & R being on at once; if only one side is on (turn signal) it won't send a signal to the Center brake light. I didn't think to ask if it would light the center if four ways are on, but I suppose it would. He said it's designed so it can have either incandescent or LED in the center but not with LEDs in the tails. If you have an incandescent, it should be attached to metal to dissipate heat (can use that hole in the center which is isolated from everything). I told him I wanted to add a 3rd brake light to '67 Chevelle and not have to run a wire up to the brake light switch, and he said that's exactly what is designed for. Anyway, just one possibility. Might be just as easy to run a wire as to splicing.
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post #28 of 92 (permalink) Old Jan 12th, 19, 9:08 PM
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Re: Adding a 3rd Brake Light to a '67

This device must be more than two diodes. BUT, by his description, when you're stepping on the brake pedal and the left turn signal is on, the output for the center brake light will flash because during the turn signal flash time on, the device sees power from both sides.

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post #29 of 92 (permalink) Old Jan 12th, 19, 10:43 PM Thread Starter
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Re: Adding a 3rd Brake Light to a '67

Could be, Paul. Might be easier, in the long run, to take a wire up to the brake light switch. Thanks for your input.
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post #30 of 92 (permalink) Old Jan 12th, 19, 11:51 PM
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Re: Adding a 3rd Brake Light to a '67

I'd love to be proven wrong. Maybe somebody here will buy one and try it.

Before I installed my interior last year, I put a few wires into the plastic wireway for future stereo use. Ran from the dash to the trunk. I used one of those wires to feed my third light so I don't need to fool with these devices.

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