cruise control works when it wants too

[fxdave]

i have a 97 holiday rambler endeavor wds cat powered on a freight liner chassis im having problems with my cruise control some times it works most the time it doesnt i was reading some where where there was i diode problem of some sort ? any info would be great thanks also when trying to set after a few min a a service eng light will appear blink a couple of times then go off ?

[walt2137]

Check the spade end wires to the air brake switches in the gen compartment on the firewall if they are not tight on the connection a bump generally send a signal to the cruse control box just like you had hit the brakes.

Walt

[KentandJoyce]

Hi FXDave, I have a Monaco that when the "Engine Brake" switch is on, the cruise control doesn't work. I have to disable the jake for the cruise control to function. I imagine your system is similar. If you're already aware of this, sorry for the post!, just trying to help.
Kent

[Robi.1014]

FXdave: You questioned if a diode might be at the heart of your CC problem. Most "intermittent" problems (sometimes it works, sometimes it doesn't) usually can be sourced to a connector problem or relay contacts that are failing (but there are few or no relays in the CC system). So a diode failure would be far down on my list. The check engine light flicker is probably not associated either.

In terms of troubleshooting an intermittent problem, you can help this forum by telling us more of what you've observed. For example, are any of your CC On/Off or RESUME/SET switches lighted switches when the CC is supposed to be "on"? Do you have a dash light that says "CRUISE" when cruise is activated? How about the dash warning lights that glow when the ignition switch is initially turned ON (i.e., the "idiot light" check routine). If anything associated with the CC is now glowing, that might indicate an electrical connector that is failing.

Kent mentioned braking. As you know, touching the brake or applying the engine brake will kill the current CC "on" state, and the CC "resume" function should re-apply the CC function. So it is possible that a maladjusted brake-light switch could be your "intermittent" problem source. Have a friend or your spouse follow you in a vehicle for a period of time (the rougher the road, the better). If the brake lights flicker ON incorrectly....