A slave controller for a remote vehicle starting system. A low voltage DC circuit has a plurality of parallel manually actuated switches, with output contacts in the high voltage circuit and inputs in the low voltage circuit. The disclosure also describes a novel approach for reducing or eliminating these air pockets of undesirable gas by utilizing a dip-tube. Each of the assemblies is configured as a module which can be easily accessed and quickly secured to or detached from the support body. The frame member has locking holes which respectively engage with mating locking claws of the mating connector when the connector is fitted to the mating connector, thereby maintaining the fitting state of the connector and the mating connector.