Abstract A dual battery charger system for vehicles, such as a system for charging an automobile main battery and an auxiliary battery for a camper, a mobile home, a motor home or boat, in which the system has an ignition coil and a unit having a lead connected to the main battery, a lead connected to the auxiliary battery, a switch interconnecting the leads, and a relay coil for closing the switch. The system is energized by a signal from the ignition coil of the automobile, and includes a subcircuit which protects the system in the event of a short or misconnection. The system can use a weak sensing signal to control the relay and will respond instantaneously to any condition which would be a drain from the main battery to the auxiliary battery.
A dual battery charger for vehicle electrical systems having a main battery, an auxiliary battery and an ignition coil: comprising a lead for connection to the main battery, a lead for connection to the auxiliary battery, a switch interconnecting said leads, a relay coil for closing said switch, a ground for said relay coil, a lead connected to the relay coil for energizing said coil in response to a signal from the ignition coil, and a diode in said last mentioned lead for passing the signal only in the direction to said relay coil.
Claim 2
Dependent Claim
94 words
A dual battery charger for vehicle electrical systems having a main battery, an auxiliary battery and an ignition coil: comprising a lead for connection to the main battery, a lead for connection to the auxiliary battery, a switch interconnecting said leads, a relay coil for closing said switch, a ground for said relay coil, a lead connected to the relay coil for energizing said coil in response to a signal from the ignition coil, and a diode in said last mentioned lead for passing the signal only in the direction to said relay coil.
Claim 3
Dependent Claim
61 words
A dual battery charger for a vehicle as defined in claim 1 in which a ground lead interconnects the lead from said ignition coil to said diode with the lead between said switch and the auxiliary battery, and a diode is included in said lead for rendering said interconnecting lead inoperable in the event the system is shorted or improperly installed.