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Old 30-09-2015, 00:16   #1
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Fault finding tachometer

I am trying to find out, how to measure the output from the tachometer drive wire, that has been fitted on my alternator. With the engine running the tachometer indicates a fixed speed (no use at all) I get a DC voltage there of about 6.5 volts, and from the little I understand the tachometer works
, by measuring ac frequency, so has the tacho wire been connected to wrong part of the alternator. Any clarification appreciated

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Old 01-10-2015, 22:24   #2
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Re: Fault finding tachometer

It would be good to get some feedback, as I don't want to strip this thing down for nothing.
Thanks

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Old 01-10-2015, 22:43   #3
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Re: Fault finding tachometer

Did you select AC volts on your multimeter?? The tach output is before the diodes, and the AC voltage should vary with alternator output level. My multimeter also measures frequency.
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Old 19-12-2015, 04:22   #4
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Re: Fault finding tachometer

Sorry about that, did not get a notification of reply. All fixed now thanks


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