[DeTomaso] More cruise control issues

Sun Sep 6 01:24:12 EDT 2009

Chris:

Having been away from the computer lately, I'm not quite "up to speed" with your current Cruise Control Adventures (CKCCA for those of us who enjoy acronyms).  And that also means I'm not aware of the details of the "sending unit" that you received from our very own electrical wizard (which would be EWSOB, or possibly The EWSOB).  In any case, I thought that possibly you might like to try my VSS generator.  The only caveat is it requires an electronic speedometer, rather than the ubiquitous mechanical Veglia.  The advantage of the electronic is you can calibrate it yourself, with any handy "known" 2 mile stretch of highway.  

However, even if you don't have a 20th century electronic speedo, at least you would be able to determine if the VSS is the root of your troubles.... or not.  It installs into the ZF's speedo cable connection, and then you run three wires to wherever you need the signal.  Ground, 12VDC+, and the signal.  With our ZFs, this converter provides a square wave signal that all the new electronics devices need in order to recognize rotational speed.  The converter for our ZF's is the Speed Sensor HE22C.  

The other piece of information that you need is the frequency of the HE22C.  This is needed so it will interface with your CC correctly.  The HE22C generates 16 pulses per revolution, in a square wave.  This somewhat/kinda/mostly/generally/maybe equates to 25,600 pulses per mile. 

Again, if you want to try my square wave generator, I'll be glad to mail it up to you... 

Chris

Chris Difani
'73 L #5829 "LITNNG"
The Electric Pantera
Sacramento, CA
Email: cdifani at comcast.net 

--------------------------------------------------------------------------------

----- Original Message ----- 
From: "Christopher Kimball" <chrisvkimball at msn.com>
To: <sobill at aol.com>
Cc: "Pantera List Serve" <detomaso at realbig.com>
Sent: Saturday, September 05, 2009 7:46 PM
Subject: Re: [DeTomaso] More cruise control issues

> 
> Dear Bill,
> 
> I received your sending unit today (thank you) and installed it for the test run, but what happened when I tried operating the cruise control was quite a surprise, to say the least.
> 
> When I pushed the "set/accel" button on the dashboard control, the car floored itself and took off like a rocket until I hit the brakes so as not to rear-end the car several hundred yards ahead of me!  I tried several more times, only to have the same thing happen.  Only once did it begin to act remotely like a cruise control, but then it acted like I was flooring it, letting off on the gas, then flooring it again, and so on.  That only lasted a few seconds before it turned itself off.
> 
> The Dakota Digital technician with whom I spoke said I should hook the tach wire from the cruise control box to the wire that goes directly from the 6AL box to the tachometer.  Since I'm using a tach adapter, however, I'm thinking maybe the problem is that I should be hooking the cruise control's tach wire to the tach wire coming from the 6AL box before that wire goes into the tach adaptor.  The tach adaptor's signal may be unrecognizable to the cc unit, but maybe the unadulterated signal from the 6AL is what the cc is looking for.
> 
> Or, it could be the guy I talked to gave me the incorrect switch positions for the 12 tiny switches inside the cruise control brain.  After all, I did get completely different answers the two times I called technicians at Dakota Digital about my cruise control hookup questions.
> 
> Any thoughts?
> 
> Sincerely,
> 
> Chris
> 
> 
> 
> From: SOBill at aol.com
> Date: Thu, 3 Sep 2009 11:28:44 -0400
> Subject: Re: [DeTomaso] More cruise control issues
> To: chrisvkimball at msn.com
> 
> 
> 
> 
> 
> 
> 
> 
> The lower right corner of the attached diagram has the electrical 
> connections: Red = ignition switched 12V; White = VSS signal; White/Black (or 
> just Black) = Ground.
> 
> Feel free to use it.
> 
> Have fun,
> 
> SOBill 
> Taylor
> sobill at aol.com 
> 
> 
> In a message dated 9/2/2009 11:27:30 P.M. Pacific Daylight Time, 
> chrisvkimball at msn.com writes:
> Great!  I just installed everything except the sending unit 
>  (which, of course, I don't have yet) and tomorrow morning I'll call MSD with 
>  my last two "where do these wires go?" questions.  I believe I read that 
>  the sending unit needs +12, ground and the VSS wire, three total, so I'll run 
>  those tomorrow night and have it all ready to go by the time the sending unit 
>  arrives.
> 
> Is it OK if I try it out, or would you feel more comfortable 
>  if I just made sure it fit the threads and then sent it back?  I assure 
>  you, if anything happens to it that causes any damage at all, I'll replace it 
>  immediately.
> 
> I really appreciate your help; this is very kind of 
>  you.
> 
> Sincerely,
> 
> Chris
> 
> 
> 
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