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Don, I do not believe I have it backwards.
From Volvo Service Manual [green book] Section 3 Electrical System [TP11402/2 Mar 80] page 20 and 21 show plots of regulated voltage vs ambient temperature.
From an updated version of the manuals Section 3⎬] Charging System [TP 30729 Mar 85], pg 7,
"The regulated voltage varies with the temperature of the regulator. As the temperature of the regulator increases, the regulated voltage decreases. On some 1985 and later models, the regulator is connected to a temperature sensor located beneath the battery tray; thus, the regulated voltage is more precisely matched to the system's immediate requirements."
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