TwinTurbo.NET: Nissan 300ZX forum - Just a guess but your alty may have gone bad. With
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Subject Just a guess but your alty may have gone bad. With
     
Posted by jzack on June 29, 2016 at 2:55 PM
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In Reply To Electrical issue, drain, post major upgrade. posted by Z ONLY1 on June 29, 2016 at 02:13 PM
     
Message car warmed up and idling, headlights on...what voltage do you read across the battery terminals? Should be high 13 volts or low 14s. If lower than say 13.7v it's the Alty. A bad alty diode bridge will drain down the battery fairly quickly when car is off.

This is the easiest thiing to check. Report back if not the issue.

     
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