BD exhaust brake effecting cruise control

[ChadBasan]

I have a 2005 Dodge 3500 5.9 Cummins with a Bad Dawg exhaust brake..the break is working at idle but for some reason it won't work when rolling. for some reason it is affecting the cruise control and the cruise control won't work. I unplugged the wires leading to the cruise control from the FDIV and the cruise control begin to work but I'm still having problems with the exhaust brake when rolling. Could I have a bad FDIV? Thanks

 

[Prairie Dog]

What's a FDIV?
Hopefully it's not part of the exhaust brake - which should not be connected to the CC in any way.

 

[p-Bar]

From what I remember when I installed by BD brake you do tap into the cruise control. If I were you call BD they will help you troubleshoot this .

 

[Prairie Dog]

Hmm, I'm curious why they would do that when the others don't.

 

[ChadBasan]

Its actually a DFIV sorry, it is a Dodge Ford Idle Verifier. I will call BD thanks

 

[Prairie Dog]

Ah, I see it in the manual on page 25 http://www.dieselperformance.com/productManual/(I-00083)_2023330_-_2023331_-_2004.5-07_Dodge_TM_Exhaust_Brake2.pdf
I have no idea why they thought they needed it but they do seem to connect to the CC. Personally if the DFIV failed I would take it out of the circuit and wire it like the other brands.

 

[p-Bar]

Praire Dog . I read through it again and it disables the cruise control if the brake is on . Hey Chad ask them why they disable the cruise control? thanks

 

[Prairie Dog]

That would be a problem for me, I like to use the EB and cruise at the same time. The trucks ECM works with both of them seamlessly.
After ten years of using it that way I can't see where it's a bad thing.

Scott

 

[Prairie Dog]

Deleted.
Stupid double post!

 

[BD-Hector]

The cruise has always been disabled when the brake is activated otherwise they will fight each other. as for the brake not coming on check the pink with of the DFIV if it does not have 12V when the brake is active and the throttle is at zero fuel, it could be the DFIV of the TPS is not reading zero fuel to activate the DFIV.

 

[p-Bar]

Thanks for popping in on this thread Hector. Guess I tapped into the wrong wires on mine as the cruise still works . I tested it today. I understand what you mean about fighting one another.

 

[Prairie Dog]

The cruise has always been disabled when the brake is activated otherwise they will fight each other. as for the brake not coming on check the pink with of the DFIV if it does not have 12V when the brake is active and the throttle is at zero fuel, it could be the DFIV of the TPS is not reading zero fuel to activate the DFIV.

I wouldn't say they've always disabled the cruise - I know of no other EB brand that does so. Besides, they cant both come on at the same time if that's what they're worried about.
The trucks ECM puts out a low signal to the relay that controls the EB only when the throttle is at 0%. Once the CC pushes the throttle above 1% the EB shuts off.

They do work nicely together though. Like when you ascend a hill and then start to accelerate beyond the CC set point coming down the other side. The EB kicks in as needed to slow the truck. It all works seamlessly - at least on my truck.

Scott