Adding a 3rd Brake Light to a '67 - Page 4 - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

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post #46 of 92 (permalink) Old Jan 25th, 19, 11:50 AM Thread Starter
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Re: Adding a 3rd Brake Light to a '67

Paul, when you connected to the orange wire at the brake light switch, is that the regular pre-third light switch?


The Monte light takes an 1156 incandescent bulb, but you can substitute an 1156 type LED bulb. I've heard some are brighter than incandescent and some aren't.


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post #47 of 92 (permalink) Old Jan 25th, 19, 2:41 PM
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Re: Adding a 3rd Brake Light to a '67

You have to use the more modern switch as I originally stated, otherwise you will get a flashing 3rd brake lamp when hazard flashers are activated. While some may like this, this is actually against Federal Motor Vehicle Safety Standardsóand that is why switches were redesigned with the extra terminals when 3rd lamps (CHMSLís (center high mounted stop lamps) were first introduced.

You splice into the orange wire at the original connector and run your new wire to one side of the extra contacts on the new switch. The other side of the extra contacts go out to your 3rd brake lamp. For extra protection, you can install a fuse between your factory orange wire and the new contact connection.

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post #48 of 92 (permalink) Old Jan 25th, 19, 3:01 PM Thread Starter
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Re: Adding a 3rd Brake Light to a '67

Thanks, Joe, that clears everything up.

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post #49 of 92 (permalink) Old Feb 4th, 19, 4:25 PM Thread Starter
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Re: Adding a 3rd Brake Light to a '67

OK, please bare with me, guys, I'm not much on electrical stuff. I picked up a new Standard SLS110 stop light switch which is for an '86 Monte w/o cruise. There are two pairs of terminals; let's call one pair A and B and the other pair 1 and 2. With my ohm meter and the button depressed, I get continuity between A and B but not between 1 and 2. With the button released, no continuity between A and B but continuity between 1 and 2. It doesn't matter whether the button is depressed or not, I get no continuity between A and 1, A and 2, B and 1, or B and 2. I don't have my Chevelle here to try anything (the 3rd Brake Light isn't in there yet anyway).

Am I missing something? Is this the way its supposed to work? And if so, how would I wire it? I assume the two wires on the '67 are Hot and to the brake lights. So for the 3rd setup, is it Hot to (say) A and B to regular brake lights, then jump A to (say) 1, and 2 to the third brake light?

I know this is probably really simple for most of you guys and I thought I had it all worked out until it tested the continuity.

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post #50 of 92 (permalink) Old Feb 4th, 19, 4:50 PM
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Re: Adding a 3rd Brake Light to a '67

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Originally Posted by Rickles View Post
OK, please bare with me, guys, I'm not much on electrical stuff. I picked up a new Standard SLS110 stop light switch which is for an '86 Monte w/o cruise. There are two pairs of terminals; let's call one pair A and B and the other pair 1 and 2. With my ohm meter and the button depressed, I get continuity between A and B but not between 1 and 2. With the button released, no continuity between A and B but continuity between 1 and 2. It doesn't matter whether the button is depressed or not, I get no continuity between A and 1, A and 2, B and 1, or B and 2. I don't have my Chevelle here to try anything (the 3rd Brake Light isn't in there yet anyway).

Am I missing something? Is this the way its supposed to work? And if so, how would I wire it? I assume the two wires on the '67 are Hot and to the brake lights. So for the 3rd setup, is it Hot to (say) A and B to regular brake lights, then jump A to (say) 1, and 2 to the third brake light?

I know this is probably really simple for most of you guys and I thought I had it all worked out until it tested the continuity.

.
SOunds like maybe the pair A-B is for Cruise Control disconnect.

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post #51 of 92 (permalink) Old Feb 4th, 19, 5:09 PM
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Re: Adding a 3rd Brake Light to a '67

Correct, that switch is for cruise control.

Rick, I'm not sure of the wiring colors on a 1967 car.

Take a test light and ground one end. The other end, touch to one terminal on the brake light switch while it's connected. If the test light lights up, that's the feed to the switch. The other terminal should be dead until you depress the brake pedal. Run a wire from THAT terminal (or wire attached to it) to your third break light.

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post #52 of 92 (permalink) Old Feb 4th, 19, 5:25 PM Thread Starter
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Re: Adding a 3rd Brake Light to a '67

Rockauto says this is without Cruise, the AC Delco looks the same w/o cruise and the ones with cruise are 4 terminal also, but without a plastic post between two of the terminals.


Paul, won't that have the 3rd flashing with the 4-ways? That's why I got the '86 Monte switch.



Top is W/O Cruise, the one I got.
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Last edited by Rickles; Feb 4th, 19 at 5:47 PM.
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post #53 of 92 (permalink) Old Feb 4th, 19, 5:30 PM
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Re: Adding a 3rd Brake Light to a '67

Both of those are for brakes and cruise. One pair of contacts are normally open, the other pair normally closed.

For cruise control, a interruption in the power feed shuts it off.

You don't need it, the standard brake switch is all you need.

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post #54 of 92 (permalink) Old Feb 4th, 19, 6:19 PM
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Re: Adding a 3rd Brake Light to a '67

There is indeed an issue with the parts listings.

Locally, I asked for a non-cruise Standard brand switch. SLS110 is what was presented to me with the tell-tale divider plastic between the second set of contacts. WRONG!

The ďdividerĒ switch is not correct for what you want. You donít have cruise.

Paul, why do you keep telling him to use a regular switch? Iíve already explained this.

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post #55 of 92 (permalink) Old Feb 4th, 19, 6:39 PM Thread Starter
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Re: Adding a 3rd Brake Light to a '67

I guess I'll just keep what's in there then. I can't remember the last time I even used 4-ways on a car. Thanks, fellas.


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post #56 of 92 (permalink) Old Feb 4th, 19, 7:52 PM
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Re: Adding a 3rd Brake Light to a '67

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Paul, why do you keep telling him to use a regular switch? Iíve already explained this.

In my post # 45 above ( https://www.chevelles.com/forums/11016388-post45.html ) I said my test showed the standard switch provides power for a third brake light without issue. When you step on the brake pedal, it provides power from the brake light switch to the brake lights BEFORE it goes through the turn signal switch in the steering column.


It's really very simple. Splice into the correct wire. Run it to the third brake light. No special switch needed. And the double pole switch for cars with cruise control has the extra terminals in the wrong mode to send brake light power. They OPEN when you step onto the brake pedal.



I'll take pictures tomorrow.

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post #57 of 92 (permalink) Old Feb 4th, 19, 8:51 PM Thread Starter
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Re: Adding a 3rd Brake Light to a '67

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Originally Posted by Coppertop View Post
There is indeed an issue with the parts listings.

Locally, I asked for a non-cruise Standard brand switch. SLS110 is what was presented to me with the tell-tale divider plastic between the second set of contacts. WRONG!

The ďdividerĒ switch is not correct for what you want. You donít have cruise.



Joe, what part number (Standard brand?) did you end up with that worked? Could it be SLS159?
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post #58 of 92 (permalink) Old Feb 4th, 19, 9:07 PM
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Re: Adding a 3rd Brake Light to a '67

Standard brake light switch. Two wire connector plugs in. One wire is hot, the other wire goes to the turn signal switch. The switch contacts are OPEN if you're NOT stepping on the brake pedal. The switch contacts CLOSE sending voltage to the tail lights through the turn signal switch.
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post #59 of 92 (permalink) Old Feb 4th, 19, 9:12 PM
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Re: Adding a 3rd Brake Light to a '67

Brake light switch + cruise control switch. The same plug used for the brake lights on the standard switch goes on the terminals closer together to each other. The plug latches in just like the standard brake light switch.

Pertaining to the brake lights, this switch functions exactly as a standard brake light switch.

The other pair of terminals which are set wider apart are for the cruise control and it's contacts are CLOSED when you're NOT stepping on the brake pedal. Step on the pedal and the switch contacts open. This cannot be used for any kind of brake lights.
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post #60 of 92 (permalink) Old Feb 4th, 19, 9:38 PM
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Re: Adding a 3rd Brake Light to a '67

Paul,

What your missing here is the backfeed issue.

Reread my original posts.

I never said your way wouldnít work.

What you failed to realize from the start was the flashing third brake lamp during hazards operation when you wire it your way with a stock switch.

To each his own, you can do what you want, but I stated the facts an am correct. If you want your third brake lamp to be compliant like a modern car, you simply canít wire it like you stated. If you just want it to work in the most simple form, then yes, you can just splice into the factory wiring. Case closed .

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