Chevelle Tech - View Single Post - Tach gets interference from headlights, brakes, and horn
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post #4 of (permalink) Old Dec 28th, 18, 6:33 AM
Gtogeoff
Senior Tech Team
Geoff
 
Join Date: Mar 2015
Location: Australia
Posts: 1,865
Re: Tach gets interference from headlights, brakes, and horn

I would connect a voltmeter across the battery & check it once the engine has fired. Look for any over voltage [ higher than 14.5 v ] or voltage spikes. If you get any of these, the wiring in the charging cct should be checked for bad connections &/or alt & volt reg checked.
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