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Topic: secret? switches inside dash (Read 387 times) previous topic - next topic

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secret? switches inside dash
2002 U295 36'      I'm installing an electronic trailer brake controller in the coach and was able to find the extra wires loom inside the dash, nice! I was searching around for the retarder brake light relay. I would like to delete the brake...

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Re: secret? switches inside dash
Reply #1
Lots of info on the forum.  Those are momentary switches so you can read codes from the Allison Transmission and and Cummins ECUs when you have a check engine lights, etc.

There's also one near the middle of the dash whose purpose is the momentary...

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  • hdff
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Re: secret? switches inside dash
Reply #2
My retarder brake light relay was behind a carpeted small panel in front of the brake pedal on the floor on my 2000 U320

Re: secret? switches inside dash
Reply #3
Michelle and Keith, thank you for the info. Jim.

Re: secret? switches inside dash
Reply #4
My retarder brake light relay was behind a carpeted small panel in front of the brake pedal on the floor on my 2000 U320
Thanks for the picture, I will add a switch to the trigger wire to that relay...

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Re: secret? switches inside dash
Reply #5
It's kind of funny, we all have such differences of opinion... I think the brake lights coming on with the retarder is one of the best safety idea's someone came up with !
Having driven truck many years I really appreciate brake lights.. The...

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Re: secret? switches inside dash
Reply #6
It's kind of funny, we all have such differences of opinion... I think the brake lights coming on with the retarder is one of the best safety idea's someone came up with !
Having driven...


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  • hdff
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Re: secret? switches inside dash
Reply #7
The brake lights don't flash when activated by the retarder they stay on, while on they activate the electric trailer brakes too which isn't good for the trailer brakes.
That's a good idea craneman if I knew which wire was the trigger

Re: secret? switches inside dash
Reply #8
The brake lights don't flash when activated by the retarder they stay on, while on they activate the electric trailer brakes too which isn't good for the trailer brakes.
That's a good idea craneman...


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Re: secret? switches inside dash
Reply #9
Dave , you are absolutely correct about the safety aspect. I had planned on using a switch on the relay ground wire but this will require  more driving attention on my part. The retarder activating the brake lights is a great safety feature but...

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Re: secret? switches inside dash
Reply #10
The ground wire would be much easier to find. I was trying to avoid taking the panel off beside the drivers seat to trace a wire on a switch that might not even be in that location.