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24v Wolf rev counter RPM gauge

Discussion in '101's and Military' started by purplemk, Jul 5, 2018.

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  1. purplemk

    purplemk Member

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    Hello all
    Just wanted to ask if anyone has ever fitted a rev counter gauge to a 24v wolf or other 24v land rover?
    I know that normally a rpm gauge would run from the signal wire on the alternator but as far as I can see there is no connection on either of the wolf's RRC8642 or RRC8560 alternators.
    Any thought appreciated

    Thanks
     
  2. fv1620

    fv1620 Member

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    The AC output terminal for a tachometer sensor is only on the EEGR vehicles (that is just the vehicle alternator not the FFR one).
     
  3. purplemk

    purplemk Member

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    Sorry what does EEGR stand for?
     
  4. fv1620

    fv1620 Member

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    Electronic Exhaust Gas Recycling for which the system needs an engine speed input.
    The EEGR alternators have the main output then on a two-terminal block there is the warning light connection & next to it the AC feed to the EEGR module. It is simply a take off at the junction of two stator windings before they pass to the diodes for rectification. It would be a simple matter to tap this off on a non-EEGR alternator.
     
  5. purplemk

    purplemk Member

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    Ok I'm with you now thanks, so what your saying is that I should be able to run a signal wire off from my current alternator so that's good. Although I'm more mechanically minded than electrical so I'm a bit unsure as to exactly where to take the feed from, I'll have to do some more research.
    Thanks for the reply
     
  6. fv1620

    fv1620 Member

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    Sometimes people think that you can use an AC tap off point like that to drive an AC voltmeter to give an indication of RPM. Of course that doesn't work because the regulator controls the current through the field winding, so it needs to go something to read the frequency & of course the speed that the alternator rotates at is not the same as the engine speed.
     
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