GTA clocks, voltage supply

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GTA clocks, voltage supply

Postby MFaulks » Mon May 30, 2016 6:44 pm

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Re: GTA clocks, voltage supply

Postby JohnC » Mon May 30, 2016 8:48 pm

Hi Martin,

According to the manuals, The Red wire is 12v switched by the ign switch ..... it comes from the large connector on the LHS of the instrument panel ..... not regulated. However it is either not regulated, or it is regulated within the rev counter itself.
The Black is connected to 12v negative, and the yellow wire carries the tacho signal which I suspect, in the turbo engine, comes from the ECU,. It comes through the large LHS connector Pin 1..
I hope this answers your question. :) .

John
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Re: GTA clocks, voltage supply

Postby MFaulks » Tue May 31, 2016 12:55 am

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Re: GTA clocks, voltage supply

Postby simontaylor » Tue May 31, 2016 8:37 am

I would expect the tacho signal to come from ECU too, but some one tolld me recently that it comes from the coil-pack (ignition power module).
Have a peek at the workshop manual, page C-11. Seems there is a 5v control signal from the ECU to it. I wonder what the output voltage from Tacho pin is?
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Re: GTA clocks, voltage supply

Postby JohnC » Tue May 31, 2016 11:44 am

simontaylor wrote:I would expect the tacho signal to come from ECU too, but some one tolld me recently that it comes from the coil-pack (ignition power module).

Yes .... you are quite right Simon, someone did mention it some time ago, but I had forgotten about it, :( ......Thanks for that, ...... Martin, please note. :up

John
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