Barney,
Can one use the battery charger to calibrate the tach?
How would it be done?
Bob
On Thu, 19 Oct 2006 04:15:23 -0500 Barney Gaylord <barneymg@MGAguru.com>
writes:
> At 10:33 PM 10/18/2006 -0700, Philip Jones wrote:
> >....
> >.... when he turns the ignition to the "on" position, the
> >tachometerjumps to ~3000 rpm and stays there. ....
>
> Disconnect the battery charger before switching on the
> ignition. When you do yet it running again, recalibrte the
> tachometer.
>
> The (rectified) 60 cycle hum from a battery charger can make an
> electric tachometer read 3600 rpm with ignition on and engine not
> running (120 pulses per second). The 50 cycle hum in Europe would
> make the tach read 3000.
>
> Barney Gaylord
> 1958 MGA with an atttitude
> http://MGAguru.com
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