tegwin
|
| posted on 23/11/08 at 03:04 PM |
|
|
Tacho wiring?
I have a very ancient Smiths Telemetrix guage... its electronic.... 6Cyl...
What is the "standard" method of connecting such a guage to the engine?
Should it be linked up to the -ve terminal on the coil pack? Or is there any other way of doing it?
------------------------------------------------------------------------------------------------------------------------
Would the last person who leaves the country please switch off the lights and close the door!
www.verticalhorizonsmedia.tv
|
|
|
|
|
MikeRJ
|
| posted on 23/11/08 at 04:30 PM |
|
|
Can't be Telemterix surely, they are a very modern range of Smiths gauges?
If it's an original Smiths gauge, you need to check whether it's the RVI type that senses current pulses, or the RVC type that senses
voltage on the coil. It will usually be written the the very bottom of the dial.
|
|
|
r1_pete
|
| posted on 23/11/08 at 05:06 PM |
|
|
Can you post a pic of the back of it? some have a positive feed and a feed from the switched side of the coil, & gnd of course, the feed from the
coil is used to drive the tach this is the RVC type.
Another type uses the ignition feed wire wrapped around a conductor to induce a current for every ignition pulse, this is the RVI type......
Most tachs will have RVI or RVC written on the face.
|
|
|
tegwin
|
| posted on 23/11/08 at 07:48 PM |
|
|
My mistake... definitely not telemetrix...
Its an RVI type.
So does that mean it just needs to be connected to the +ve wire that feeds the coil (ignition live) as well as a negative connection?
If thats the case, then its a clever little bit of kit
------------------------------------------------------------------------------------------------------------------------
Would the last person who leaves the country please switch off the lights and close the door!
www.verticalhorizonsmedia.tv
|
|
|
02GF74
|
| posted on 23/11/08 at 08:02 PM |
|
|
to add to wot the boyz ^^^ sed.
voltage type just taps off the - terminal on the coil.
the current type connects in between the - terminal and the points; this is because, as ^^^ say, the there is a loop made that acts like the
primary of a transformer; the other loop picks up the current to the electronics inside.
see below.
 
Rescued attachment rev.JPG
|
|
|
tegwin
|
| posted on 23/11/08 at 10:37 PM |
|
|
Appreciate your input all...
Unfortunately... that does not compute!
Its definitely says its an RVI 2631/01
But there is no "loop" on the back...
Just a load of random connectors on the back...
Can anyone shed some light on this?
[Edited on 23/11/08 by tegwin]
------------------------------------------------------------------------------------------------------------------------
Would the last person who leaves the country please switch off the lights and close the door!
www.verticalhorizonsmedia.tv
|
|
|
MikeRJ
|
| posted on 23/11/08 at 10:57 PM |
|
|
The later RVI tachos are slightly different, the induction loop is internal to the tacho and are connected to the male and female bullet connectors.
The spade connector is the switched ignition supply, the case should be grounded.
Note these tacho's will usually not work if you have electronic ignition, they are designed for use with points.
[Edited on 23/11/08 by MikeRJ]
|
|
|
tegwin
|
| posted on 23/11/08 at 11:10 PM |
|
|
Mike RJ... thanks 
When I took the dashboard out of the car I didnt pay much attention to where things were plugged ( my mistake)... But there were deffinately NO bullet
connectors on the tacho...
Only a +ve and -ve.... is it possible that it has been converted to RVC? Because at some point in the past the car HAS had an electronic
ignitiion system fitted.... and then removed....as I have some of the bits :S
---------------
Edited to say... this looks possible..
Although, I dont have a Balast resistor...or wire to starter soloid..... Seriously...someone has really buggered about with this cars wiring in the
last 30 years lol
[Edited on 23/11/08 by tegwin]
------------------------------------------------------------------------------------------------------------------------
Would the last person who leaves the country please switch off the lights and close the door!
www.verticalhorizonsmedia.tv
|
|
|
MikeRJ
|
| posted on 24/11/08 at 08:09 PM |
|
|
It's entirely possible it's been converted (it's quite a popular mod), but wouldn't explain how it could have worked if
neither of the bullet connectors were used. The RVC requires a switched ignition, ground and coil negative connections, your tacho only has two spade
connectors other than the bullets.
This might be useful.
[Edited on 24/11/08 by MikeRJ]
|
|
|
