I bought this '98 12V Ram 3500 CTD in Oct and have not found out what this cable does. It runs from a **** in the cab to the fuel pump, I believe. It has no brand name on it and does not appear to change idle speed. Anybody know anything about this?
This is the **** mounted in the cab.
http://img.photobucket.com/albums/v6...m/DSC00510.jpg
It goes straight to this connection on the pump
http://img.photobucket.com/albums/v6...m/DSC00509.jpg
From further back
http://img.photobucket.com/albums/v6...m/DSC00511.jpg

 

What you have there is a in cab mounted fuel control. You can control the RPM of the moter with that, just turn to the left and pull out. If You have that, you might just have a PTO mounted to the tranny

 

either that or a go faster control.

my first thought was that you could lay the throttle to the floor, pull that little guy and get more juice.

but now that Troy mentioned that, it would seem like a better explanation.

 

It doesn't change RPM speed at all. It is a twist to adjust (as in it takes about 7 turns to go fully in either direction). But I did notice with it all the way clockwise, I lose A LOT of power and something in the engine seems louder (maybe the pump??), and I don't get any black smoke while heavy pedal-ing it. Could this increase my fuel mileage, or am I just adjusting something that shouldn't be adjusted?

 

Drew, could this be connected to some kind of adjustment inside the injector pump? I know the older 12v pumps were all mechanical and can be adjusted. What do you think?
Troy