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10-15-2003, 07:13 PM
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CC Member
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Join Date: Mar 2001
Location: Santa Clara,Ca,USA,
Posts: 79
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Not Ranked
Speedo doesn't work
Okay all you experts here goes:
I've got the VDO speedometer, tach,etc. The Tach works fine but the Sppedometer doesn't work. It has light and power. What be the trick. I'm using a tremac TKO 5-speed if that helps.
I don;t worry about spped. If there is someone in front of me, I'm going too slow but I guess I better get it working before the cherry light folks find out!
ANy help would be appreciated. Its one of the last details to get worked out.
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10-15-2003, 08:28 PM
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CC Member
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Join Date: Jan 2001
Location: Halfmoon,
NY
Cobra Make, Engine: in the search, engine 351 Windsor
Posts: 226
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Not Ranked
is there a gear in the transmision???
__________________
will have a cobra .... someday
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10-15-2003, 08:36 PM
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Senior Club Cobra Member
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Join Date: May 2001
Cobra Make, Engine: A CSX Cobra,1966 GT350 and an '06 Ford Heritage GT
Posts: 1,829
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Not Ranked
Is the VDO mechanical or electric?
__________________
"I think we have more machinery of government than is necessary, too many parasites living on the labor of the industrious." Thomas Jefferson
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10-15-2003, 08:50 PM
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CC Member
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Join Date: Mar 2001
Location: Santa Clara,Ca,USA,
Posts: 79
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Its electrical. I think maybe I need a sensor but there is a connector hanging off the Tremac that looks like it actually may be a supplied sensor?
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10-15-2003, 09:23 PM
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CC Member
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Join Date: Dec 2001
Location: San Diego,
CA
Cobra Make, Engine:
Posts: 2,979
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Not Ranked
For the electric speedo there should be a pick up that goes into the tranny in place of the normal cable with the wire leads on it.
__________________
Remember, It's never too early to start beefing up your obituary.
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10-15-2003, 10:25 PM
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CC Member
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Join Date: Jan 2003
Location: Tennessee,
Posts: 21
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Not Ranked
If your speedo is electrical and programable find out how many pulses per second that your sensor puts out. Certain programmable guages can only read a certain range. The other option is to see if your VDO gauges offers a pulse sender in place of yours which can also correct the problem. If your problem persits give these guys a call there website is Speedometersolutions.com
They can do anything, they even took my old mechical driven speedo cable and put a pulse generator on it so I could change my system from mechanical to electrical. It is pretty neat stuff and all for $90 bucks not bad. I hope this helps  |
10-15-2003, 11:58 PM
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CC Member
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Join Date: Dec 2001
Location: Olympia/Lacey,
WA
Cobra Make, Engine: West Coast. 514 / 6 speed Richmond overdrive
Posts: 1,981
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Not Ranked
Solving this exact problem right now
6 speed Richmond gear tranny and Autometer programmable electric guage, electric sender on the tranny, (stock Richmond gear)... I suspect at this point that the sender is bad, since the required signal is 16 on/off square waves per revolution of the tiny shaft in the sender, @ 12VDC. It is now sending .10/.05 volts DC.. no good/insufficient for the Autometer's requirements, it wants 12 volts on/ 0 volts off, 16 square wave pulses per revolution of the shaft... 
Highly recommend that you call the tech line at your speedo company, AND your tranny company, and reconcile the data... !
__________________
James Madison, father of the Constitution, said, "If Tyranny and Oppression come to this land, it will be in the guise of fighting a foreign enemy." He also said, "No nation could preserve its freedom in the midst of continual warfare..."
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http://www.standdown.net/index.htm
Last edited by Back in Black; 10-16-2003 at 12:01 AM..
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10-18-2003, 08:51 AM
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CC Member
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Join Date: Jan 2003
Location: Tennessee,
Posts: 21
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Not Ranked
If your only getting 10 volts. Have you looked at your ground wire? I think on your autometer the programmalbe speedo needs its own ground or it get interference from any other ground attached to it.
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10-18-2003, 10:01 AM
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CC Member
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Join Date: Dec 2001
Location: Olympia/Lacey,
WA
Cobra Make, Engine: West Coast. 514 / 6 speed Richmond overdrive
Posts: 1,981
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Not Ranked
That was a suspicion voiced at the tranny shop
So we disconnected the sender unit and tested it, same results (By the way it is putting out .10 volts, not 10 volts) We tested an Autometer sender I have, and it puts out whatever supply voltage is given it, in the correct square wave (this unit wont work on my cobra because of the rediculous cruise control sender projection, won't fit under the car)
VDO makes a sender that, according to a tech @ the VDO tech line, puts out a 16 pulse signal per mechanical revolution, @ 4 volts.. we are going to try that, I have one coming from www.jegs.com ($49.95) certainly the cheapest part of this fix.
By the way, just in case you are correct, I am going to give the speedo it's own ground... it is ganged up now (By the way, I was formerly a R & D computer/electronics technician, and the in-dash wiring is not up to the kind of work I would want my name on, especially the crimp work and the too-tight/short wire lengths, but it's passable)
__________________
James Madison, father of the Constitution, said, "If Tyranny and Oppression come to this land, it will be in the guise of fighting a foreign enemy." He also said, "No nation could preserve its freedom in the midst of continual warfare..."
~~~~~~~~~~~~~~~~~~~~~~~~
http://www.standdown.net/index.htm
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10-19-2003, 08:19 PM
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I'm a bonehead!
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Join Date: Sep 2000
Location: Evergreen,
Or
Cobra Make, Engine:
Posts: 155
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Not Ranked
West Coast Cobra
B 'n B
Any way we can communicate directly about West Coast Cobras?
EricD
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Cheddar
You WON!!... AGAIN!!! Now, y'all, take some accountability. It might still work out.
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10-21-2003, 10:59 AM
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CC Member
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Join Date: Aug 2002
Location: SOUTH FLORIDA,
Posts: 135
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VDO
MY VDO ELECTRIC SPEEDO STOPS DEAD UNDER ACCELERATION THEN ZOOMS UP TO THE CORRECT SPEED WHEN I LEVEL OFF OR SLOW DOWN. I DO HAVE THE T-5 PICKUP ALSO.
ANY SUGGESTIONS?
B. SMITH
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10-21-2003, 11:37 AM
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Senior Club Cobra Member
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Join Date: Jul 2002
Cobra Make, Engine:
Posts: 15,712
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Not Ranked
Electric speedo on the Excal? Must have been a factory change I guess. My '94 had the standard cable for speedo.
Oh,,,and check your mail, I'll send you some private info on the sale of my Excal.
Ernie
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10-21-2003, 10:49 PM
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CC Member
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Join Date: Jan 2003
Location: Tennessee,
Posts: 21
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Not Ranked
B Smith
My Dolphin guages did the same thing and we went back and forth with the manufacturer. We never did figure out the problem. Then my guages went belly-up. All of them except the gas guage. No one seems to know why. The only thing I can tell you is that your tach will start to play up and down or read a thousand rpm off and then they will all die.
I hope you have better luck
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