Question about 2005 GMC Yukon Denali
Volt meter somtines 13v , sometime 14volt ,somtime 15volt.
Posted by Anonymous on
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Posted on Jan 02, 2017
They have expensive tools and equipment to test alternators but you can get by with a simple digital volt meter. With the volt meter on DC voltage attach each lead to the corresponding terminals on the battery. With the engine running and all the electrical loads on (such as the head lights, radio, defrost, wipers, radio etc). the voltage reading should be between 13 and 14 volts. If you actually only have 9 volts then the alternator isn't charging and you'll have to look in to that more. The truck wouldn't be able to start or run very well with only 9 volts so i'd be willing to bet the gauge is bad or possibly a wiring fault.
Posted on Jan 02, 2010
You should test battery next day 12.5V,should check alternator 14.5V You should check first which is bad.then replace.
Posted on Feb 19, 2013
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