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How to Wire a Cap/Topper Brake Light on a 2004 Ford Ranger XLT Extended Cab


Garageguy60

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I looked back by the spare tire area, frame area, where the wiring harness starts to go through frame in back then heads towards the middle of the truck, and I DO NOT SEE and green wire taped off anywhere. I did find a trailer plug, a rubber plug with a little rubber cap connected to it. So I opened it up and saw one round prong and 3 round holes. So I went to NAPA store and bought a matching rubber plug with 3 round prongs and one round hole. Plugged both together,skinned off tips of 4 wires, a green wire,yellow wire,brown wire, white wire. Then at the cap brake light I have 2 wires coming from their, one Red wire and one Black wire. So I took those 2 wires and wired a disconnect to it (red to red, black to black) then I had my Wife get inside the Ranger and had her press the brake pedel as I touched the red wire coming from cap brake light and the touched the black wire to the white wire. the cap brake light comes on when the brake pedal is pressed, and goes out when taking foot off the brake pedal. So I thought that was correct. Just to mention, I tried touching the black wire coming from the cap brake light to the other wires (yellow,brown) with the pedal pressed and the cap light didnt come on, only when I touched to the white wire (black to white) so, when left turn signal is blinking, cap brake light DOESNT Blink which I believe thats how it should work correctly, When right turn signal is blinking, the cap light BLINKS,which it shouldnt work that way to be correct. So now im Puzzeld ????? What do I do to keep the cap light from blinking with the right turn signal on ????? PLEASE HELP ??? Thanks.
 


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PetroleumJunkie412

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Your truck is possessed.

The blinking cap light is the demon in your truck trying to communicate in Morse code.

Write down the blink sequence, but DO NOT translate it.

Contact your nearest priest that is certified in exorcisms, and relay the message.

Filling your windshield washer reservoir with Holy Water will help in the interim.
 

ericbphoto

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Well. Here is what the 4 wires are that you found. Connecting your black to the white is correct. Your red wire could connect to either the yellow or green and it will work as a brake light AND as a turn signal for one side. Not quite what you want. We'll have to find a wiring diagram for your truck to figure out where to pick up just the brake signal. Usually that can be found back near the tail lights.

CURT_Replacement_Wiring_Harness_Installation_Option.jpg
 

ericbphoto

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I believe you were on the right trail looking for an unused plug with a light green wire in it. Connector C403 M. But I don't know where it is. You could pick up that signal at the cab mounted third brake light. But that's an awkward place to get it for your cap.
 

pjtoledo

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Last edited:

sgtsandman

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It sounds like your taillights are like mine. With tail lights that have the turn signal and brake light in one bulb, you need an adaptor module to prevent the third brake light from blinking with the turn signal.

I need to change mine out. They burn out internally over time and cause the the third brake light to blink again. Mine is doing that after something like 10 years since it was installed.
 


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