Third Brake Light Wired to Tail lights - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 04-03-2008
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Third Brake Light Wired to Tail lights

I was wondering if it's possible to wire my brake light the one that's above the back window so it's on when my tail lights are on. I think this would give it some depth, I just think it would look really cool, please give me some pointers as my dreams can come reality lol. No but seriously before I end up gutting the inside of my ranger. thanks.
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Old 04-03-2008
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I am pretty sure it already does. Mine does not even work
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Old 04-03-2008
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Is there a way to wire the 3rd break light up to blink when your blinkers are on?
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Old 04-03-2008
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I want that light I guess it's called the dome light to be on when my tail lights are on, I know it goes on when my brake lights are engaged but I was wondering if they could be on all the time, that is when my lights are on!
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Old 04-03-2008
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Originally Posted by Lord Of War View Post
Is there a way to wire the 3rd break light up to blink when your blinkers are on?
Yeah you have to add a resistor in it or something
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Old 04-03-2008
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Originally Posted by blackranger02 View Post
I want that light I guess it's called the dome light to be on when my tail lights are on, I know it goes on when my brake lights are engaged but I was wondering if they could be on all the time, that is when my lights are on!
dome light is in the cab...

i think you are wanting the third brake light to be dual filament, so that it is on when your lights are on and then brighter like when you hit your brakes right?
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Old 04-03-2008
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are you talking about something like this?

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Old 04-03-2008
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Originally Posted by Lord Of War View Post
Is there a way to wire the 3rd break light up to blink when your blinkers are on?
Your CHMSL has positions for three bulb sockets and is made in either an all red or a white/red/white (cargo light) style.

If the outer bulbs are wired to the front blinkers or rear blinkers on a 3-bulb truck, they will work only with the turn signals. If the outers are wired to the brake/turn filamants of a 2-bulb taillight truck, then they will operate the same way as its taillights - brake lights will light unless the turn signal is illuminated on that side.

My CHMSL has the all-red lens and is wired the second way, to the 2-bulb stop/turn filaments:

If the brakes are on without blinkers, all three bulbs light as brake lights.
If brakes and a blinker are on together, 2 bulbs are brake and one outer one blinks.
If a blinker is on without brakes, then the outer bulb on that side flashes alone.
The two outer bulbs also flash with the 4-ways.

Obviously, if you currently have cargo lights in the outer positions, you would have to give them up to do this mod.
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Old 04-03-2008
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Originally Posted by rwenzing View Post
Your CHMSL has positions for three bulb sockets and is made in either an all red or a white/red/white (cargo light) style.

If the outer bulbs are wired to the front blinkers or rear blinkers on a 3-bulb truck, they will work only with the turn signals. If the outers are wired to the brake/turn filamants of a 2-bulb taillight truck, then they will operate the same way as its taillights - brake lights will light unless the turn signal is illuminated on that side.

My CHMSL has the all-red lens and is wired the second way, to the 2-bulb stop/turn filaments:

If the brakes are on without blinkers, all three bulbs light as brake lights.
If brakes and a blinker are on together, 2 bulbs are brake and one outer one blinks.
If a blinker is on without brakes, then the outer bulb on that side flashes alone.
The two outer bulbs also flash with the 4-ways.

Obviously, if you currently have cargo lights in the outer positions, you would have to give them up to do this mod.
I want to do that EXACT thing, and have wanted to since i bought my truck. Is their anyway you could pm me more info on how to do this? If others want to know also then I can maby make another thread asking how rather then jacking this one anymore.

sorry blackranger02.
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Old 04-03-2008
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A 98 came from the factory with 3-bulb tails, so the brake and turn functions are on separate bulbs. It would be easy to wire the outer bulbs in the CHMSL to the front blinker wires on the left side of the steering column:

L= light green/white
R= white/light blue

If the brake light function is also desired on the outer bulbs, it could be picked up from the trailer tow circuits instead:

L= yellow from fuse 7
R= dark green from fuse 5

IMO, this is best done with the all red lens, especially if the lights will come also on with the brakes. Some CHMSL's do not include cargo lights but they have the holes for the 2 extra sockets just the same. If needed, the additional sockets and bulbs can be sourced from a junkyard or auto parts store. The stock bulbs are 906 or 912.
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Old 04-04-2008
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as for schatten789 thats fine as I think I know what to do now. thanks boys!
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Old 04-04-2008
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hrm, i think im going to wire mine up that way now.

idk if i want to run wires all the way from the back of my bed to the cab..
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Old 04-04-2008
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No need for that - everything is available in the interior. For turn signals only, a 97 CHMSL could be wired to the front blinker wires on the column.

FWIW, I should add that this mod might be technically illegal for some reason (turn signal spacing, height, whatever). Mine's been wired this way for years and a lot of others have done the same mod. I've never heard of anyone getting stopped for it - just something to think about.

Also, only the highest standard of workmanship should be applied to any vehicle lighting project. Sloppy work could seriously compromise your safety.
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Old 04-04-2008
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i would want it to light up when i hit the brakes and blink with the turn signal, so i would have to run wires from the trailer harness.
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Old 04-04-2008
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Quote:
Originally Posted by 5speedin2.3 View Post
i would want it to light up when i hit the brakes and blink with the turn signal, so i would have to run wires from the trailer harness.
98~2003 have the trailer tow wires at the dash fuse panel which makes it easy to do both brake and turn - that's how they are wired into my 03 CHMSL. If you don't want blinkers only, it looks like 97 would need a 3->2 converter like you've already added at the back of your truck for the 2-bulb tails.
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Old 04-05-2008
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I had third brake light turn signals a few years back. Used my little brother's all red lamp, and the "former cargolamp location" for the signals. Spliced into that cluster of wires under the driver's seat, routed the wiring into the cab, up the C pillar, and into the lamp. Worked like a charm. They acted just like the "high beams" worked on the rear stop/brake light....so all 3 lit up when you hit the brakes, they'd flash when you turn on your signals...they'd do exactly when your brake/stop lamp would do.

I have vids on a disc somewhere....it's been probably 2 or 3 years since I did it though. I'll see if i can't find them, but if i do, i'll make a new thread on it.
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