Classic speedometer

[enjenjo]

I have a problem with this one, it doesn't work. At all. It has power in the right places, and the sender is hooked up right, with new wires, twisted like the instructions. Any one with any insight?

[phat46]

Any one with any insight?

 It's broke?  That's the extent of my knowledge on the subject...

[enjenjo]

Any one with any insight?

 It's broke?  That's the extent of my knowledge on the subject...

Heck, I knew that  I was looking for something more.

[phat rat]

Heck, I knew that  I was looking for something more.

A little more help.  Not only is it broke,  but I don't know what's wrong with it.    

[Pep]

I have a problem with this one, it doesn't work. At all. It has power in the right places, and the sender is hooked up right, with new wires, twisted like the instructions. Any one with any insight?

I don't know if I'm much help but I have a VDO programable speedo in my 34 and I accidently blew it up when I first installed it. I had it temporarily wired up and drove it for a few days. I then went to make it more permanent and stupidly found what I thought was a good ground. I found out later that night it was a ground behind my lights. When I turned the lights on the speedo went crazy, then stopped. Luckily it had a few Kms on the odometer so it was replaced under waranty ( I didn't confess to blowing it up myself  ) I did notice when I got the new one that by just connecting up the power the needle jumped slightly. I assume that was a good indication that the movement and detector circuitry as working OK. I'm not certain if the Classic ones work the same. I have mine sitting waiting to go into the 37 so I'm not much help there. I have also heard the senders are not the same. I heard the Classic senders send a square wave as opposed to the others that are a sine wave. I find it hard to believe that you can get a square wave out of a flying magnet past a coil but I may be missing something. Even so, I would also expect a pulse of either type to be suitable as a trigger. I would get any old sender and hook it up to the speedo and spin it by hand and eliminate which end is faulty...The speedo itself or the sender. I can get hold of a Cro from work if I have the same problem....See if you can get hold of one to test out the sender. Just by spinning the sender in your hand, the Cro should show the pulses ( I recall 8 pulses per rev)...good luck

[Bob K]

Heck, I knew that  I was looking for something more.

A little more help.  Not only is it broke,  but I don't know what's wrong with it.    

Not only is it broke and I don't know what's wrong with it. I don't know how to fix it.

B :?: B

[Bob K]

Classic told me that you must be sure to have a dedicated ground and and a dedicated power source.

B B

[enjenjo]

I have the dedicated power supply and ground. I talked to Classic at the nats, and he told me I needed a twisted pair on the sender wires to keep out spurious signals. I did that, and still no workie. I hate to pull the speedo unless it's really necessary, it will require tearing apart the whole dash, AC and most of the wiring. Speedo installs from the rear of the dash. I'll see if I can come up with a sender to experiment with.


You guys are a barrel of laughs, kick a guy when he's down, don't ya.

[Bob K]

You guys are a barrel of laughs, kick a guy when he's down, don't ya.

What are friends for?? What the heck good are they if you can't pick on em.


B :b-d: B

[Bruce Dorsi]

I can get hold of a Cro from work if I have the same problem....See if you can get hold of one to test out the sender. Just by spinning the sender in your hand, the Cro should show the pulses ( I recall 8 pulses per rev)...good luck

Speak English (or at least, American) please, Pep!  

What's a Cro? ... An oscilloscope?

[Pep]

I can get hold of a Cro from work if I have the same problem....See if you can get hold of one to test out the sender. Just by spinning the sender in your hand, the Cro should show the pulses ( I recall 8 pulses per rev)...good luck

Speak English (or at least, American) please, Pep!  

What's a Cro? ... An oscilloscope?

Yeah Bruce, I'm also showing my age...It means Cathode Ray Oscilloscope but in these days its more likely a digital cro...not a cathode ray in sight.

[tomslik]

I have a problem with this one, it doesn't work. At all. It has power in the right places, and the sender is hooked up right, with new wires, twisted like the instructions. Any one with any insight?

put a dvom on the sender and spin the wheels, should make ac voltage if the sender is ok.

[Dave]

I have a problem with this one, it doesn't work. At all. It has power in the right places, and the sender is hooked up right, with new wires, twisted like the instructions. Any one with any insight?

Im bettin theres nuttin  you can do cept send it back.. Its shot.... When using twisted pair the best way is twisted pair with a ground wire and only ground one end of it. That gets rid of the spurrious componets that may affect the operation.. I usually check to see if its grounded at the trans end then leave the ground unhooked at the speedo end. Wanna see how this stuff works ? stop by and ill fire up a thousand watts of rf in the radio room and we can set off some stuff in the house if i do it right LOL... In reality its the same principal just different voltages and such but id be more concerned with shielding with a ground than a dedicated ground or power line..
My nickle...
Dave

[phat46]

Im bettin theres nuttin  you can do cept send it back.. Its shot....



 Hey, isn't that what i tol' ya in the first place!!?  
( there's one in every crowd)

[enjenjo]

Ok Joe,Dave finally convinced me you were right all along.

I called classic today, and it looks like it is shot. They said send it back and they'll check it out. Easier said than done. :cry:  It's going to take several hours to get it out.