RPM ENGINE COUNTER

[Artimes]

These are usually connected for thier signal to terminal "W" on the alternator. What signal is transmitted from the alternator. Is it an analogue voltage ie 0-14V dc, or a square wave as a pulse at a frequency proportional to speed. Thanks in anticipation of info

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[paulrossall]

My understanding is the "W" stands for winding and that is what the terminal is connected to. The current is AC and something increases in proportion to the revs increasing. I guess it must be the volts but an expert will confirm this.

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[AndyL]

Frequency. nm

.

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[spannerman]

Thw 'W' terminal is connected to one of the 3 outputs from the stator before the diode bridge, and is an AC voltage of 5volts that increases frequency with speed, so would therefore be an analogue signal.

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[Artimes]

Thanks to all for info

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[aztec]

c'mon then.. spill the beans, have you discovered a way to rig up a revcounter that doesn't cost £££'s?

and if not, what counter have you got?

just wondered...

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[Artimes]

nO NEW DISCOVERY but second hand unit picked up for ££30 from volvo users site sale and wanted

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[tgalea]

Is it at all possible to install an RPM counter with a two AC wire output from the alternator ? The counters in the shops all seem to need three AC outputs.

Any help would be appreciated.

Thanks in advance
Tyrone.


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[spannerman]

Hi Tyrone, not sure which make tacho you are looking at but most have three connections + to ignition switch, - to earth, and the signal to the alternator, thats the minimum for it to work from an alternator.

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