cruse control dosn't work

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Chad - 11 Apr 2006 01:09 GMT

2004 cummins 6 speed
the other day I installed a electric brake controler and the next day the
cruse would turn on but not engague. so I unpluged the controler and still
no cruse.so I checked the brake switch and lights and they worked fine and
so did the clutch switch for the starter so I just fumbled around with wires
and connectors and the next day cruse worked then today I moved the
controler and now no cruse I did the same as before but still wont work ?
help

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GeekBoy - 11 Apr 2006 01:30 GMT

You did not mention the obvious while messing with electrical compoenents.

fuses

> 2004 cummins 6 speed
> the other day I installed a electric brake controler and the next day the
[quoted text clipped - 4 lines]
> controler and now no cruse I did the same as before but still wont work ?
> help

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Chad - 11 Apr 2006 01:48 GMT

fuses are good and the dash light that saya cruse comes on so it turns on

> You did not mention the obvious while messing with electrical compoenents.
>
[quoted text clipped - 8 lines]
>> I moved the controler and now no cruse I did the same as before but still
>> wont work ? help

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TBone - 11 Apr 2006 03:14 GMT

Your best bet would be to look at the mechanical side. Not having a new
diesel, I don't know how it operates on your vehicle but if it is a vacuum
controlled motor, check to make sure it is still getting a vacuum on its
input and if it is an electric stepper motor, make sure it is still
connected.

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If at first you don't succeed, you're not cut out for skydiving

> fuses are good and the dash light that saya cruse comes on so it turns on
> > You did not mention the obvious while messing with electrical compoenents.
[quoted text clipped - 9 lines]
> >> I moved the controler and now no cruse I did the same as before but still
> >> wont work ? help

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Tom Lawrence - 11 Apr 2006 03:40 GMT

> input and if it is an electric stepper motor, make sure it is still
> connected.

You left out the option of there being no motor at all (vacuum, electrical,
or otherwise).... because with a manual tranny, there's nothing mechanical
that needs to be manipulated (no TV cable like on an automatic). All cruise
control functions are handled directly by the ECM (it ignores the APPS
input, and substitutes it's own fueling levels based on desired vs. observed
speed), so the only thing that he could have mucked up is the brake switch
sense circuit... the ECM thinks the brake is depressed, so it won't engage
CC.

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