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Brake Lights Out

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#1 dennisr



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Posted 24 July 2014 - 01:23 PM

I have a  1999 Dutch Star, 300 hp cat on a Freightliner xc chassis. The brake lights are out.  The hazards, turn signal, tail lights, and 3rd brake light (above the engine hatch) work.


I have talked to Freightliner and have directed me to find the diodes (2) that are under the dash coming out of a 8 pin connector below and between the steering column and the ignition switch and shift selector.  There is a red wire coming out of the 8 pin connector that needs to be found for the repair.


I have not yet found the connector as there is a rats nest of wires in that location to make the fix. 


Has anyone had this similar problem?



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#2 DickandLois


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Posted 24 July 2014 - 05:14 PM



Welcome to the FMCA Forum!


One that I know of. Yes there are 2 of them and he found them outside in the rats nest of wires in one of the bundles, where the wires exit the coach; Drivers side wires raped with electrical tape.


They very well could be inside.


The connector should be between the steering wheel(close to the column) and the ignition switch(is the SW to the right or left of the wheel)Then the wire they are referring to is routed to the transmission selector location, and bundled with some other wires in many cases.

Find the 8 pin connector, how much wire is between the connector and where the bundle go's  through a hole in the firewall? if there is very little length, then the diodes could be outside.


Can you read Electrical Drawings? I have the chassis wiring diagram for your year chassis! Can forward you a copy. I can send you a Privet Message, it will appear in the little envelope in the top right corner. Just to the left of your Monogram( Dennisr) if you like so you can reply directly to me.


Click on the envelope to open the read and reply box.

If you look at this link and at the picture of the diodes I got from Radio Shack. That will give you an idea of there size. Generator issue link> http://community.fmc...nator-problems/


The brake light switch(s) are located under the coach and are activated by the air brake valves. The switch's are air activated.

Check them first as they are easier to fine, using a meter / or test light in this case will work to find the hot wire.

Is there 12 volts on one of the terminals on the switches, check the second switch next to the first one. They are kind of round in shape and thread into the air brake valve(s) 2 terminals on each switch.


When you find them, is there voltage present? have a helper depress the brake peddle(you will need air pressure built up) is there voltage on the other terminal when the brake peddle is pressed? on all the contacts?


Finding the diodes is time consuming and also requires a great deal of persistence.



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#3 dennisr



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Posted 27 July 2014 - 03:04 PM

Hi Rich,


Thanks for responding.  I have not been able to your info out.  Can you go over once again how I can talk to your direct?


Are you saying that the diodes are inside the coach under the dash or could they be outside in a large wire loom.


Can you go over again how we can talk direct?    Thanks...........Dennis



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#4 wolfe10


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Posted 27 July 2014 - 03:07 PM



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