[DeTomaso] More cruise control issues

Sun Sep 6 01:49:45 EDT 2009

I do have the old style speedometer, but it sounds as if the unit you have is almost exactly like the one SOBill sent me to try out--same installation and same three-wire hook up.  

If it were putting out frequencies that were too fast or to slow, that would probably mean the cc unit just wouldn't work at all, wouldn't it?  I don't think a steady signal, even at the wrong frequency, would cause the cc unit to suddenly accelerate.  But then, these days I'm having to ask my sons how to work my computer.  The last time I took any electronics classes was in my first year of college, back when Bill Gates was only, well, in college!

Sincerely,

Chris

From: cdifani at comcast.net
To: chrisvkimball at msn.com; sobill at aol.com
CC: detomaso at realbig.com
Subject: Re: [DeTomaso] More cruise control issues
Date: Sat, 5 Sep 2009 22:24:12 -0700

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
> 
> 
> 
> 
_______________________________________________
> 
> Detomaso Forum 
Managed by POCA
> 
> Archive Search Engine Now Available at 
http://www.realbig.com/detomaso/
> 
> DeTomaso mailing list
> DeTomaso at list.realbig.com
> 
http://list.realbig.com/mailman/listinfo/detomaso