Cruise control?
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Junior User
Joined: May 2006
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From: La Luz, NM
Cruise control?
I have installed a Rostra cruise control in my 2001 5.4 engine equipped '56 F100. The cruise works fine but when I disengage the clutch before canceling the cruise the engine revs up. The blue wire is to be attached to the ignition system to prevent this, with this coil on plug ignition I don't know where to attach the blue wire. Anyone know how to help?
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Junior User
Joined: May 2006
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From: La Luz, NM
Rostra
They do have a tech line and I left a call. Have not heard back from them. Thanks for the response.
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Junior User
Joined: May 2006
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From: La Luz, NM
one wire resonse
I did attach the blue wire to one of the negative coil wires...it may be responding but it is slow. I might try making a small harness to attach to several coil wires...what do you think?
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Junior User
Joined: May 2006
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From: La Luz, NM
Coil on plug?
I'm not real sure you are correct about this. I am thinking that the blue wire needs to be on the negative side of the coil. The signal to fire comes from the computer to the positve side and the coils may not fire out of sequence as long as I am taking my signal to the cruise from the neg side. What do you think?
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Lead Driver
Joined: Aug 2002
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From: Saskatoon SK Canada
Ford computers always use the ground to control electrical items. Less electrical load placed on the computer. Unless you wired diodes into your multiple tach wires to prevent accidental coil discharge but the signal would also be blurry as would be several tach signals put together.
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Cargo Master
Joined: Jun 2001
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From: Oxford, Indiana
51dueller speaks the truth. Most automotive ECM's have "sinking" outputs. This means that they are wired so that a positive 12V is constantly supplied to the output devices and the computer switches them on and off by closing the circuit to ground on the negative side. There just isn't any way without a bunch of diodes to combine the coil signals. Have you studied the schematics and ECM pinout carefully? There is often an output feed for a tachometer supplied from the ECM in multiple coil distributorless systems. That signal would be perfect for your cruise control.
Beyond that, here's another idea. The overrev protection directly from the ignition system is nice, but if you can't locate a useable tach signal, you can get the same effect from installing an interrupt switch on the clutch pedal. This is the way the OEM's do it. Many vendors carry an aftermarket mechanical brake light switch that could easily be adapted to the clutch pedal. Every aftermarket cruise system has some sort of a brake light tie-in to cancel the cruise if you step on the brakes. Just wire the clutch pedal switch in series with the brake light input for the cruise servo and it should cancel the cruise if you hit either pedal.
Beyond that, here's another idea. The overrev protection directly from the ignition system is nice, but if you can't locate a useable tach signal, you can get the same effect from installing an interrupt switch on the clutch pedal. This is the way the OEM's do it. Many vendors carry an aftermarket mechanical brake light switch that could easily be adapted to the clutch pedal. Every aftermarket cruise system has some sort of a brake light tie-in to cancel the cruise if you step on the brakes. Just wire the clutch pedal switch in series with the brake light input for the cruise servo and it should cancel the cruise if you hit either pedal.
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