vehicle 2 equals 12 v then the voltage v 2 at the positive jump start post 24 on vehicle 1 and the voltage v 2 u2032 at the positive jump start post 24 u2032 on vehicle 2 would each equal approximately 11v this voltage falls in a range that would typically partially or fully satisfy the set of predetermined conditions necessary to close the switch 28 28 u2032 on each vehicle note that it is not necessary for the resistance values of the resistors 32 32 u2032 to be approximately equal for the present invention to function further there is no need for an additional button to initiate a jump start between two vehicles similarly equipped with this invention 0045 fig3 illustrates one vehicle connected to another vehicle for jump starting with incorrect polarity each vehicle having the embodiment of the present invention as depicted in fig1 and 2 fig3 depicts the same items as shown in fig2 except that a first jumper cable 102 having an electrical resistance 104 is shown connecting the positive jump start post 24 on vehicle 1 to the ground battery terminal 16 u2032 on vehicle 2 a second jumper cable 106 having an electrical resistance 108 is shown connecting the ground battery terminal 16 on vehicle 1 to the positive jump start post 24 u2032 on vehicle 2 fig3 depicts switches 28 and 28 u2032.