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Old 10-02-2011, 09:30 PM
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Running State Detection (Generator L-Terminal)

Hi,

Does anybody know which wire/circuit is for detecting the engine running state? In my alarm manual it says Generator's L-Terminal. Is it the same as Alternator? Where is this wire located?

This wire should have ~0 volt before start, and ~12v after engine start. I am thinking maybe I can attach this to one of the injectors if I cannot find the correct wire. Any ideas?

Thanks...
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Old 10-03-2011, 05:42 AM
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Re: Running State Detection (Generator L-Terminal)

Generator and alternator is the same thing. But i have never heard of the L-terminal. The positive terminal on the alternator has always 12 V as long as the battery is connected, so that one you can´t use. You could maybe use the auto shutdown relay output, after fuse 16 (15 A) in the power distribution center. The auto shutdown relay is normally only powered with engine running. ( it powers up in fact as soon as the ignition switch is put in run, but after 2 seconds and not started, it switches off again)
The output from the ASD relay is also going to the injectors and the ignition system, but there is no fuse besides the 30 A main fuse ( Nº 6 in pdc).
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Old 10-03-2011, 07:02 PM
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Re: Running State Detection (Generator L-Terminal)

Quote:
Originally Posted by Frango100 View Post
Generator and alternator is the same thing. But i have never heard of the L-terminal. The positive terminal on the alternator has always 12 V as long as the battery is connected, so that one you can´t use. You could maybe use the auto shutdown relay output, after fuse 16 (15 A) in the power distribution center. The auto shutdown relay is normally only powered with engine running. ( it powers up in fact as soon as the ignition switch is put in run, but after 2 seconds and not started, it switches off again)
The output from the ASD relay is also going to the injectors and the ignition system, but there is no fuse besides the 30 A main fuse ( Nº 6 in pdc).
Thanks Frank. I think it is a European car thing. I think I am going to attach this wire to B+1 on the key cylinder.

I also found this on http://oljeep.com/gw/alt/edge_Alternator_Theory.html, but it is for CS Jeeps not WJ. Of course I have no idea what he is talking about.

10. The CS terminals are designated as follows:

P-Terminal: The Pulse/Phase terminal can provide a 12V square wave to determine alternator speed, used by some Electronic Control Modules or vehicle computers. Connects to the stator. Some ICU’s monitor this signal and adjust engine parameters accordingly.

L-Terminal: This terminal is connected to the “Low” side of the warning lamp, with the lamp’s “High” side being fed by the ignition circuit. Some regulators require a 35-ohm resistance inline with this circuit if no lamp is used otherwise alternator damage may ensue. Some applications have a resistor connected in parallel to the lamp in case the lamp bulb opens up and burns out. The resistor will be there to provide a path for current and voltage. Some vehicles supply a 5Vdc reference to this terminal from their ECU or Computer; other vehicles don’t, so be aware of the various models of regulators. Other regulators may be tested by application of a 50-Ohm pull-up resistor to connect the L-Terminal to the 12Vdc source, I believe that any resistance between 35 Ohms (5-Watt resistor) and 500 Ohms (1/2 Watt resistor) can be used safely.

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