contactors 58 and 60 between their opened and closed positions and a conductor 57 which connects the switch contactor 58 to the contact 56 the master module 24 includes a resistor 64 which is a current limiting resistor for the battery pack charge in the heavy recharge mode from the cigarette lighter harness such a resistor can be obtained from nte as part number 5wo22 connected in parallel with the resistor 64 is a thermistor 66 which is also in the battery pack charge circuit from the cigarette lighter harness and is current limiting for a normal charge and if higher charge rates are required it will increase in value and actually allow resistor 64 to remain as the current limiting device for the charge mode from the cigarette lighter harness the thermistor 66 can be obtained as a western digital ptc switching thermal resistor number wp3005de100n the resistor 64 and thermistor 66 are connected by a conductor 68 to the contact 50 the conductor 68 having a diode 69 therein allowing the current in conductor 68 to flow only in the direction from the contact 50 to resistor 64 and the contact 50 is connected by a conductor 70 to the connector pin 30 and is operable to be energized thereby a conductor 72 having a rectifying diode 73 therein connects the conductor 70 to a conductor 74 the latter in turn being connected to the positive terminal of a capacitor 76 which capacitor is used to filter source voltage from the 110 volt ac source to avoid.