Rev Counter layout

[Shazzbat]

Hello all. Just received a rev counter and clock binnacle. I will try to fit it to my car during this Friday, since it is a local holiday here.

Although I think that the wiring layout that's fluttering in my head is correct, I would like someone more used to P6 gives me a hand, just to confirm.



This is the clock's wiring. No problem here, as the connections are the same used currently to the original clock. I realize that lamps and earths are linked together with those coming from the rev counter.

This is the rev counter wiring. Apart from lamp and earth wires, I see three other wires, one white and yellow, one black and white and the green one.
My inspiration says to me that the black and yellow must be connected to the coil, the black and white to the dizzy and the green one to the ignition.

This is the complete sight of the binnacle.

So, please confirm if I am right:

White and yellow to the coil

Black and white to the distributor

Green to the ignition

Black (rev counter + clock). Earth. To be connected to the existing wire for the original clock.

Purple. Clock. To be connected to the existing wire for the original clock.

Red + Red & White (rev counter + clock). Lamps. To be connected to the existing wire for the original clock.


Looking forward to being illuminated by your invaluable knowledge.


Regards

 

[Shazzbat]

I need your help.

Maybe the rev counter I have got is busted, but the case is that I spent this whole morning fighting with it with any success. The gauge is dead no matter the connections I've tried out.

Would you mind to help me with the wiring?

I think that I only have to use these two wires marked A and C. A for the pulses coming from the coil (by the way, positive or negative terminal?) and C for the engine start. B is only used for 6 volts wiring.

Am I right?

Give me a hand, please.


Thanks and regards

 

[chrisyork]

OK. I'm pretty sure you'll find that you wire the tacho in series with the wire between the distributor and the coil. ie, low voltage power goes from the coil to either A or B, and returns from the tacho to the distributor from the other. C is earth!

Hope that helps

Chris

 

[Shazzbat]

Thanks Chris. Do you mean that I have to connect either A or B to the coil, B or A to the dizzy and C (green wire) to the ground?

If so I think then that I have to dismantle the wire which currently connects both devices, so that the rev counter wires are connected in series. Am I right?

Well, tomorrow I will have a go. I will keep you up to date with my progress.

Thanks and best regards.

 

[Demetris]

Thanks Chris. Do you mean that I have to connect either A or B to the coil, B or A to the dizzy and C (green wire) to the ground?

If so I think then that I have to dismantle the wire which currently connects both devices, so that the rev counter wires are connected in series. Am I right?

Well, tomorrow I will have a go. I will keep you up to date with my progress.

Thanks and best regards.

Regarding A and B wires, i think you got it right. There should be no straight connection between the coil and the dizzy, the connection should include the tacho in series, and for this you should use the wires A and B.
The green wire (C) should be connected to switched positive, probably through the ignition switch. IF your rev-counter is negative earth of course.
Black is ground as usual.

Demetris

 

[Shazzbat]

Thanks, Dimitris. I think that I've got the hang of it.

The harness installation is already done, so the trick is just to try out different connections. Yesterday we tried several combinations with no success, but to be honest I did not think about dismantling the wire between the coil and the dizzy.

Looking forward for tomorrow to come. I am pretty sure that it will work at last!

Regards

 

[Shazzbat]

Fail.

I made this connection, turned the contact on and... wow, the gauge flew up to the 7.000 rpm while the engine was not even on!

So, I beg for your help once again.


Regards

 

[Demetris]

I will remove mine to check when i'll get home tonight.

EDIT. My tacho (RVI) is wired as i described, even though the wiring diagrams in the workshop manual remain silent about this.
Take a look at the pics if it is of any help.

Demetris

 

[Shazzbat]

Thanks Demetris. I suspect the problem is in the device.

The connection is clear; in your case yellow wires come and go to the coil and dizzy, green wire is positive, black is earth and red and wite is the light. I made this very same connection, but as soon as I switched the contact on the gauge went fast to the 7000 rpm line which means something is wrong in my rev counter internal coil.

Anyway I left the device at an electronic workshop for them to have a look, but to be honest I am not hopeful at all.


Thanks and regards