From BR Training booklet:

Unmodified Regulators (Battery Charge Contactor fitted)
The settings for an unmodified regulator are:-

VSR  30.5V  CLASS 116 VEHICLES ONLY

        29.5V  Lead Acid Batteries  )  All other generator
        31.5V  NIFE Batteries         )  fitted vehicles

VDR  LNK/2  position 1 permantley

LVS  27V  Cut-in Relay  (CIR)  28V- Lead Acid
LVS  28V  Cut-in Relay  (CIR)  29V or MAX - NIFE

The LT terminal is to be left disconnected and the wire taped back.

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