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Author Topic:   Tachometer Reading Jumps Around
hoskings posted 05-27-2007 11:06 AM ET (US)   Profile for hoskings   Send Email to hoskings  
[Describes his tachometer readings as changing suddenly.]
jimh posted 05-27-2007 04:22 PM ET (US)     Profile for jimh  Send Email to jimh     
Check the calibration control on the tachometer. Usually there is a switch to select the proper number of poles in the alternator supplying the signal to the tachometer. Perform this procedure:

Tachometer Calibration Control Cleaning

--make a note of the current position of the tachometer calibration control

--using an appropriately sized screwdriver, move the tachometer calibration control setting back and forth throughout its full range of adjustment, repeating this several times

--return the calibration control setting to the original position noted above

This should clean off the contacts in the calibration control setting switch. This often restores proper operation to the tachometer.

If this procedure does not fix the problem, let us know and we will offer additional suggestions.

hoskings posted 05-28-2007 02:55 AM ET (US)     Profile for hoskings  Send Email to hoskings     
Many thanks. [Says he will perform the procedure to restore the tachometer calibration when the weather permits.]

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