Dodge/Cummins Jake Brake problem

[KeithTaylor]

My early '04 305HP 6spd came to me with a dealer installed Dodge/Cummins exhaust brake installed right below the turbo. I have never been able to get it to work - the led light on the shifter mounted switch illuminates, but no exhaust brake action. Does anyone have a wiring diagram or troubleshooting information on these units? I really want to get this thing working for when I pull my trailer.

Thanks,

Keith

 

[TWhiteside]

The link below will take you to the Jacobs website where all the information is available for the "Dodge" version of the Jacobs Exhaust Brake.

Jacobs Vehicle Systems - Parts & Service Literature

Hope that helps!!

 

[KeithTaylor]

Thank you for your reply - your link took me right to the information section; I printed out the installation instructions which include troubleshooting info. When I bought this truck, the vacuum line from the pump to actuator was disconnected. I didn't think much of it and repaired the line. Reading the Jacobs info, I now know that running the pump without a vacuum load will kill the diaphram #@$%! I will do a little more checking, but sounds like I will be calling Geno's to get a new diaphram . . . any other ideas?

 

[KLauber]

Have clean undies handy, when you kick it on the first time, you might be so overjoyed with the sound and action, it might be too exciting..... just saying!

 

[KeithTaylor]

I'm sure of that! A friend of mine pulls a big trailer and told me it would set me forward in the seat when I got it working and turned in on while decelerating with a load on . . .

 

[jelag]

Install a vacuum gauge in the line... . you should have minimum of 25" of vacuum... . or pull the line and see if it will stick to the back of your wrist... . there should be enough vacuum for the line to stick to a section of soft skin...

 

[AH64ID]

When you buy the new pump there are 2 options, full pump and diaphragm only. It sounds like you need the diaphragm only, so that will save you money.

I would also to a leak check, as a leak is the #1 killer of the vacuum pump.