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Thread: Rev counter Help

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    Bodger

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    Rev counter Help

    I have a 2.0 Pinto mk1 escort, I am having a problem wiring up the original Rev counter, the actual instrument has the normal wire loop on the back but where do I wire this to? I intend to run a new wire as there is nothing from the original. I have looked at the original wiring diagram and it’s just to small to distinguish the runs, do I need to use the stabiliser on the back of the cluster? Any help appreciated.

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    Re: Rev counter Help

    The wire which goes to the + of the coil has to go through that loop.

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    Re: Rev counter Help

    Thanks Miniliteman, where does this wire from the coil end up after it passes through the loop and is staberliser used?

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    Re: Rev counter Help

    Wire goes from ignition key to + of coil. No voltage stabiliser is used for this.

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    Bodger

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    Re: Rev counter Help

    Thanks Miniliteman, I have taken a wire from the + of the coil passing through the Rev counter loop to the ignition switch and nothing! is there any way to test the Rev counter or am I missing something

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    Spanner Monkey

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    Re: Rev counter Help

    You also need a 12v feed to the counter aswell.

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    Re: Rev counter Help

    OK Colr6, where does the 12v go?

    Thanks
    Mark

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    Re: Rev counter Help

    Click image for larger version Name:	image.jpeg Views:	99 Size:	43.8 KB ID:	83141The white wire to the right is the feed plus also the gauge should be earthed.

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    Re: Rev counter Help

    Thanks to all, but having spent around six hours on this trying ever possible combination of wires with no result - not even a flicker of the needle, I now give in defeated. Is there a way of testing the Rev counter on its own?

    thanks
    Mark

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    Re: Rev counter Help

    If you google rev counter test rig, there is quite a novel way to do it using a high wattage bulb and a battery charger. Never done it myself but seem a good way to do it at no cost if you have a charger! Read the text through as there are two different types of rev counters. All which is explained.

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    Re: Rev counter Help

    Quote Originally Posted by Colr6 View Post
    If you google rev counter test rig, there is quite a novel way to do it using a high wattage bulb and a battery charger. Never done it myself but seem a good way to do it at no cost if you have a charger! Read the text through as there are two different types of rev counters. All which is explained.
    Link please. Ive looked and looked but cant find that page.

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    Re: Rev counter Help

    http://www.mgbimages.uk.gridhosted.c.../tachtest4.jpg

    This is off a mgb page, how to test mgb rev counter. Unfortunately I didn't get the write up in ( not very good with computers) but the theory is still the same.
    Last edited by Colr6; 03-10-2018 at 09:42.

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    Re: Rev counter Help

    Test-rig for the earlier RVI-type current pulse tachometer, used until 1973. A high-wattage 12v bulb could be used in place of the coil. Observe the correct polarity for your tachometer when connecting the battery to the 12v spade and the case. The wire has to pass the current through the pickup in the correct direction for the tachometer to register.

    Test-rig for the later RVC-type current pulse tachometer, used from 1973 on. A high-wattage 12v bulb could be used in place of the coil. Observe the correct polarity when connecting the battery to the 12v spade (+ve) and the case (-ve).

    I will get there in the end...lol sure I did read in the full write up somewhere about the pulses from the charger will give a set reading.
    Last edited by Colr6; 03-10-2018 at 09:47.

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    Re: Rev counter Help

    Hopefully third time lucky the full page !!
    Testing a Tachometer
    The AC sine-wave as found on a typical domestic mains electricity supply


    The output of a typical conventional battery charger with full-wave rectification - 100 pulses per second at 50Hz, 120 at 60Hz.

    As above but with half-wave rectification, hence half the number of voltage pulses per second i.e. 50 at 50Hz, 60 at 60Hz.

    Test-rig for the earlier RVI-type current pulse tachometer, used until 1973. A high-wattage 12v bulb could be used in place of the coil. Observe the correct polarity for your tachometer when connecting the battery to the 12v spade and the case. The wire has to pass the current through the pickup in the correct direction for the tachometer to register.

    Test-rig for the later RVC-type current pulse tachometer, used from 1973 on. A high-wattage 12v bulb could be used in place of the coil. Observe the correct polarity when connecting the battery to the 12v spade (+ve) and the case (-ve).

    Test results should be as follows:

    On a 4-cylinder tach a full-wave charger should display 3000rpm with the UKs 50Hz AC supply (3600rpm at 60Hz). A half-wave charger should display 1500rpm (1800rpm - corrected following a comment from R G Everitt).
    On a 6-cylinder tach a full-wave charger should display 2000rpm (2400rpm). A half-wave charger should display 1000rpm (1200rpm).
    On an 8-cylinder tach a full-wave charger should display 1500rpm (1800rpm). A half-wave charger should display 750rpm (900rpm).

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