Quote Originally Posted by Hodge View Post
How old is the car ?
Could it have one of those smart alternators that drop down a notch if battery is charged and/or there is no load on it ?

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2003 3lt grenade Hodge, had a new alternator about 18 months ago so was a bit skeptical about changing it. I have even disconnected the auxiliary battery to see if that was the issue but made no difference, once the engine is at operating temps it drops off to between 14.1 and 13.1. The issue with it dropping below 13.3 is it stops charging the auxiliary as the Redarc senses the voltage drop and shuts off.