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Voltage drop at acceleration

green96green96 Posts: 1
edited September 2015 in Isuzu
'96 Trooper Limited:

Experiencing a voltage drop when revving or accelerating. Drops just under 12V (per instrument guage) and pulls down HVAC blower. However, when headlights and/or park lights are on, it operates perfectly fine. Battery is new and alternator tests ok with scan tool. 

Any thoughts? 
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