Trouble Shoot Cruise Control

[benge1]

This is on a W22 Newmar Mountain Aire 2004. All of a sudden the cruise control works on and off. This last trip I quit trying to engage it. Is there any trouble shooting steps published to try to define the problem?
Benge1

[edgray]

Don't know about published, but take a look at the switch on the brake pedal. It may have gotton bumped out of position, or have a loose connection. It can cause the CC to think you are applying the brakes, which cuts off the CC. IF the switch is the problem, it MAY also mean you brake lights are on. Ed

[George Z]

Had same problem and as edgray said probably brake light switsh. Rode with my foot pulling up on brake pedal and problem ceased. A simple adjustment of the switch cured ills.

[JBDISCOVERY]

benge1,
I had a similar problem in that the cruise control would not hold. This is on a Freightliner chassis. On the advice of the Freightliner service desk, I removed the "stalk" that the cruise control buttons are on by using a small vicegrip to allow a flat screwdriver to pop the "stalk" out of the steering column. Then I used a disk brake cleaner and then lubed the switch and cycled it a good number of times. This cleaned the contacts which has allowed good service for the past year and half. Hope this might help you.
JB

[twoinabox]

I had the problem on a Southwind 35A W24. I changed the fuse and the problem was resolved. The fuse did not appear to be bad but the fix worked and still is a year later. It is a 10 amp as I recall.

[DAN L]

Quote:

Originally Posted by benge1 This is on a W22 Newmar Mountain Aire 2004. All of a sudden the cruise control works on and off. This last trip I quit trying to engage it. Is there any trouble shooting steps published to try to define the problem? Benge1

i could not find any trouble shooting info on my cc problem before i adjusted the switch. afterwards i found some info.
the brake light/cc switch plunger wore where it contacts the brake pedal on my moho. when you apply the brake, the brake light portion of the switch turns on the brake lights and the cc portion of the switch disconnects the cc.
the solution was to adjust the switch. i removed both connector plugs. they are hard to reach. then you can rotate the switch in its threaded mount for adjustment.
using a multimeter, the switch is adjusted properly when the brake light portion of the switch does not have continuity but the cc portion does have continuity with the brake pedal in the normal position. i adjusted my switch in approximately 1 turn.
i cleaned my switch with contact cleaner while working the plunger by hand before adjusting it.

["007"]

Dan L has it correct follow his procedure for adjustment.
The switch on some can also cause problems with electric steps.
I think its a great money maker for some dealers as your coach gets older.

[DriVer]

Brake light plunger adjustment!

That needs to be ruled out 1st.

The brake pedal bouncing up and down could cause the cruise to come off.

[benge1]

Well I found the plunger switch. I also found where two springs have been used to bring the brake pedal arm tight so that it does not ride on the plunger switch. Does anyone know which switch is which. One sw has only two wires the other thas several more wires. See if the pics I took help ID the problem.

["007"]

The one we are talking about is inside on top of brake pedal arm.
Its a plunger switch with threads on it and two wire plugs.
Your brake return bell crank can have a Zerk fitting installed on brass sleeve.

[DAN L]

Quote:

Originally Posted by benge1 Well I found the plunger switch. I also found where two springs have been used to bring the brake pedal arm tight so that it does not ride on the plunger switch. Does anyone know which switch is which. One sw has only two wires the other thas several more wires. See if the pics I took help ID the problem.

the extra springs that are installed should be used to return the brake pedal to the full up, off, position. the brake pedal should be resting on the stop and should be pushing on the brake light-cc plunger in this position.
the brake pedal should return to this position every time it is released.
as 007 has stated, there is or should be a grease fitting on the brake bell-crank under the hood to help the brake mechanism return to the up position. if the grease fitting is installed already, clean it and shoot grease in it until grease comes out of the top and the bottom. if a grease fitting is not installed, check oemy's website on this forum for pictures and instructions about how to install this grease fitting.
when the brake pedal is free to return to the off position freely, (every time it is released) you can begin the brake-cc switch adjustment procedure. the brake-cc switch does have 2 parts and 2 electrical plugs connected to it. the part of the switch that is closest to the plunger is the brake light switch on my moho. the other part is the cc switch.

liteOemy's Web Site - Tech Tips

[benge1]

Quote:

Originally Posted by DAN L the extra springs that are installed should be used to return the brake pedal to the full up, off, position. the brake pedal should be resting on the stop and should be pushing on the brake light-cc plunger in this position. the brake pedal should return to this position every time it is released. as 007 has stated, there is or should be a grease fitting on the brake bell-crank under the hood to help the brake mechanism return to the up position. if the grease fitting is installed already, clean it and shoot grease in it until grease comes out of the top and the bottom. if a grease fitting is not installed, check oemy's website on this forum for pictures and instructions about how to install this grease fitting. when the brake pedal is free to return to the off position freely, (every time it is released) you can begin the brake-cc switch adjustment procedure. the brake-cc switch does have 2 parts and 2 electrical plugs connected to it. the part of the switch that is closest to the plunger is the brake light switch on my moho. the other part is the cc switch. liteOemy's Web Site - Tech Tips

The one in my pic that has the red,white and blue leads would the brake switch? (correct)

[DAN L]

Quote:

Originally Posted by benge1 The one in my pic that has the red,white and blue leads would the brake switch? (correct)

on my moho, that is correct. the other half of the switch disconnects the cruise control when the brake is applied.
there should be a ''sweet spot'' where the plunger is pushed a little, but not enough to turn on the brake lights. if the plunger is not pushed enough the cc will not work. that is why you need to adjust the switch with an ohm meter.

[Full-Timers]

Quote:

Originally Posted by DriVer The brake pedal bouncing up and down could cause the cruise to come off.

I had my cruise control shut off one time when I went over a bump.