Voltage Regulators with 2 coils typically contain 1) A Cutout Relay and 2) A Combination Voltage and Current Control Relay.
Voltage Regulators with 3 coils typically contain 1) A Cutout Relay 2) A Voltage Control Relay and 3) A Current Control Relay
If there's no VR just a Cutout Relay, the LHDB light switch manually controls high or low charge
I thought the poster said Voltage Regulator ????
I think that's right, I'm NOT any IHC expert, if not my old friends Bob M or Professor Jim can educate me