Cruise Control not working - Dodge Cummins Diesel Forum

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post #1 of 7 (permalink) Old 09-04-2009, 04:53 PM Thread Starter
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Cruise Control not working

Ok so here is a puzzle.

The cruise on my truck hasn't worked since i got it. lately thats bugged me.

IDK why it isn't engaging, but i can tell you this.

1: when you push the cruise control button you can hear the servo kicking in
2: when you let go of the button it sounds like the servo kicks out
3: holding the button in does nothing when going down the highway
4: from pulling on the cable it doesn't come loose, so i do not believe it is cut.

My tach and speedometer both work correctly.

what can you guys think it would be?


1995 Dodge Ram 2500 4x4
1997 Dode Ram 3500 4x4. Has to be mostly slow and free because all the money went into the 2500
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post #2 of 7 (permalink) Old 09-05-2009, 07:39 AM
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2 things to check are the brake light switch and the vacuum hose under the drivers side battery, it rots out over time from battery acid is probably the most common cause of cruise failure. sometimes holding light up pressure on the brake pedal with your toe under the brake will tell ya if the switch is bad. There is no real adjustment for it , just go get a new one from Napa for under 15 bucks.

Dog's truck:95 2wd ex, built auto, kdp tabbed, 3 disc billet converter,3.54 gears, 4gsk, bhaf, 0 plate, rack plug, 90hp injectors, 191 DV's, htt 62/71/14, timed @17*, 60# valve springs, head studs, 4" exhaust, gauges
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post #3 of 7 (permalink) Old 09-05-2009, 11:02 AM Thread Starter
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if there was a vacuum leak the servo wouldn't be kicking in would it?

and after i got off work this morning i was sitting in the truck and i tried an experiment with the brake pedal.

i help the button in so that the servo kicked on, and then i pushed on the brake. doing so did the same as letting off the button, it caused the servo to kick off

1995 Dodge Ram 2500 4x4
1997 Dode Ram 3500 4x4. Has to be mostly slow and free because all the money went into the 2500
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post #4 of 7 (permalink) Old 09-05-2009, 11:45 AM
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You shouldn't be hearing the actuator (servo?) if you're sitting still.
It will only activate over 35 mph.
In fact I don't think the actuator makes any noise any time.

Bill
'95 2500 4wd auto
'95 3500 5 speed heavy hauler
Stock for one day
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post #5 of 7 (permalink) Old 09-05-2009, 12:25 PM Thread Starter
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i can hear an audible click from the servo when i'm sitting still, key in the run position, truck not running though.

you push the on button and there is a click from the servo, you let go of the on button or press the brake and the servo makes another click like its kicking out

1995 Dodge Ram 2500 4x4
1997 Dode Ram 3500 4x4. Has to be mostly slow and free because all the money went into the 2500
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post #6 of 7 (permalink) Old 09-05-2009, 08:22 PM Thread Starter
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ok, so i figured out the problem.

its the cruise control button itself. i tried an experiment and if i push the on button, hold it in, and push the set, the cruise control works. but the moment i let go of the on button it kicks out.

is there somewhere i can buy a new cruise control cluster or is it gonna have to be a junkyard search thing

1995 Dodge Ram 2500 4x4
1997 Dode Ram 3500 4x4. Has to be mostly slow and free because all the money went into the 2500
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post #7 of 7 (permalink) Old 09-06-2009, 12:05 PM
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Take the switches out and clean them first, they are very simple.
If they need to replaced the dealer has them for about $50

Bill
'95 2500 4wd auto
'95 3500 5 speed heavy hauler
Stock for one day
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