Center brake light module EA4094 installation

[bohussound]

Hi Guys,
I need help to connect a Center brake light module to my Big Dog Bulldog 2005. I would like to separate the brake signal from the turnsignals and I have tried to connect it but I can't get it to work. I would really appreciate if anyone out there can help me out with this issue.
Here is a link to the pdf:
http://thunder-heart.com/Tech Service PDFs/EI4094.pdf
Thanks guys.

 

[KaptinAmerika]

I am putting together a module for a customer right now with this same problem.
You can't separate the signal on BDs 04 and newer, maybe earlier but I am not really sure, as the decision is made in the EHC before the signal is sent.
You have to build a logic circuit with transistors that connects to both lines and the logic circuit decides to use the voltage that is continuous. Unless of course you don't mind if your center brake light blinks when whichever side you tied in to blinks.

 

[bohussound]

I think that is a good idea. However I would need to cut the wires from the front and rear brakes and put them in a separate circuit with it´s own fuse and then connect them to the tail light. It´s the only way without a box like you´re talking about. If you make a box like that I guess you could sell it to many Europeans. Thanks and good luck with the box and let me know how it goes.
Best
Dragan

 

[KaptinAmerika]

Why And Rear
Your going To Get A Rear Brake Light Signal Either So All You Should Need Is To Tie InTo The Rear Brake Lights

 

[Jersey Big Mike]

Actually all you need is a single transistor and a couple of resistors.
Steal the lead off the brake (switch ground when closed I believe)

base lead of pnp transistor to brake switch, pull up resistor base to 12v
emitter to 12v
collector to positive led lead for new brake light.

If I get a few minutes I calc the resistor values needed and a good pnp transistor to use.

see circuit similar here http://venus.ece.ndsu.nodak.edu/~glower/ECE321/Lectures/14 Transistor Switch.pdf

 

[KaptinAmerika]

How will you do it with one transistor Mike?
The rear LEDS are controlled by the EHC
If you hit the left blinker button and then step on the brakes the EHC will tell the Right Pod to light up as a brake light and leave the left pod blinking.
So, unless I am missing something, you will still need a logic circuit to decide which brake wire is currently carrying continuous voltage to enable the third brake light.
Otherwise you will get an alternating switch as the pod you tied into powers up and down.

 

[KaptinAmerika]

Sorry I missed that your pulling off the brake switch.
Personally I would run from that
Anything tampering with the circuit input loop of the EHC I would not mess with
I don't really like messing with the output side but I can control it better than the input side.
Just my 2 cents
Logic Gate Not