1999 Caravelle VDO Speedometer

Bhuie

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May 7, 2021
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Hello all I have a 99 Caravelle Interceptor and the speedometer isn’t working. The only thing I can tell is that there is a transducer on the back of the boat. Is this relaying speed and depth or is it just depth. If just depth then what in the world is supposed to relay the speed? Anyone have a clue on a fix?
 

Alumarine

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Feb 22, 2005
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Look on the back of the gauge.
If there's a small rubber hose going into it then it's a pitot tube gauge.

The hose attaches to either the motor leg or a fixed pitot tube pickup on the transom.

What motor do you have?
 

Bhuie

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Look on the back of the gauge.
If there's a small rubber hose going into it then it's a pitot tube gauge.

The hose attaches to either the motor leg or a fixed pitot tube pickup on the transom.

What motor do you have?
I have the Volvo 5.0. I’ll check the back of the motor. There is no pickup foot for a pitot but it may be on the foot. On another subject, The transducer on the back is broken at the hinge. Is there a replacement transducer for these?
 

Alumarine

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I can only guess that the transducer is for a depth finder.
If so, and you know the make and model, you should be able to get a new transducer.
 

Bhuie

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I do not see a Pitot hole directly in the back of the foot. There is a hole on the left side of the housing on the foot but that’s new to me if that’s where the pitot hole is. Attached is a picture.
 

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Bhuie

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I do not see a Pitot hole directly in the back of the foot. There is a hole on the left side of the housing on the foot but that’s new to me if that’s where the pitot hole is. Attached is a picture.
Also, here is what’s at the console. I do not believe this is a pitot speedometer please see attached pictures. Anyone have a clue?
 

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dwco5051

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Also, here is what’s at the console. I do not believe this is a pitot speedometer please see attached pictures. Anyone have a clue?
I think your transducer would be similar to this. Notice the paddle wheel on the transducer that generates an electrical signal to the gauge.Airmar-Transducer-P52-10-200-Khz-31-418-1-13.jpg
 

Bhuie

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YES!!! That is exactly what I need!!!! I didn’t realize a wheel was on the transducer! What part number is that???
 

dwco5051

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YES!!! That is exactly what I need!!!! I didn’t realize a wheel was on the transducer! What part number is that???
That was just one I picked up off the net to display. The one you would need depends on the make and model of your gauge. I would first check that the wheel on yours is free to spin. If it is I would next power the gauge and spin the wheel with a finger and check if the gauge show any thing. On mine I can snap it with my finger and spin it fast enough to register up to about 3 mph.
 

Bhuie

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That was just one I picked up off the net to display. The one you would need depends on the make and model of your gauge. I would first check that the wheel on yours is free to spin. If it is I would next power the gauge and spin the wheel with a finger and check if the gauge show any thing. On mine I can snap it with my finger and spin it fast enough to register up to about 3 mph.
The wheel is gone and the transducer is hanging since the bracket broke. Like there’s no way of fixing the broke piece unless someone knows of a glue that works better than the plastic itself.
 

dwco5051

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The wheel is gone and the transducer is hanging since the bracket broke. Like there’s no way of fixing the broke piece unless someone knows of a glue that works better than the plastic itself.
That signals the start of the computer game called finding a part for 20 year old electronic item. You are going to have to find the make and model as the transducers are not universal. A picture of the gauge along with any number and/or text printed on the side or back of the gauge might help narrow you search if someone on the forum has the same one.
 
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Bhuie

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That signals the start of the computer game called finding a part for 20 year old electronic item. You are going to have to find the make and model as the transducers are not universal. A picture of the gauge along with any number and/or text printed on the side or back of the gauge might help narrow you search if someone on the forum has the same one.
Ok I’ll see if I can find something. There is something on the wiring as well.
 

dingbat

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That’s called a paddle wheel speed sensor.

Common, fairly generic item actually. The issues will be finding one with the right connector to suit your speedometer.

Might be cheaper in the long run to purchase a gps driven speedo. Also much more accurate than a paddle wheel
 

Bhuie

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ok so there is NO part number for the transducer by airmar but I’m under the suspicion that it is the Airmar P32-200-VDO as attached. It amazes me here that NOBODY has had to replace a speedometer wheel/depth transducer here for a 99’ VDO interceptor but oh well. I’m going to order it and attempt to install it and will post what happens for future reference.
 

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dingbat

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ok so there is NO part number for the transducer by airmar but I’m under the suspicion that It amazes me here that NOBODY has had to replace a speedometer wheel/depth transducer here for a 99’ VDO interceptor but oh well.
Paddle wheel speedometers are notoriously inaccurate and went the way of the dinosaur when GPS speedometers went main stream 20 years ago.
 

Bhuie

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Paddle wheel speedometers are notoriously inaccurate and went the way of the dinosaur when GPS speedometers went main stream 20 years ago.
True, but I’d like to find one that fits the current system. I believe I have I need to call Airmar and ask them directly. P23-VDO-2000 looks exactly like the broken one that is hanging from the back of my boat without the speedometer wheel. I’ll post if this works if I ever get a chance to talk with them.
 

dingbat

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True, but I’d like to find one that fits the current system. I believe I have I need to call Airmar and ask them directly. P23-VDO-2000 looks exactly like the broken one that is hanging from the back of my boat without the speedometer wheel. I’ll post if this works if I ever get a chance to talk with them.
Are you sure that assembly went to the speedometer?

Upon closer inspection it looks like a transducer with a paddle wheel.

Are you sure there wasn’t a fish finder onboard at one time?

How many pins in the connector?

Be easier and probably cheap to just replace with a GPS Speedo of the same size.
 
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