Daytime running lights using turn signal lamps

Claim 1

In a vehicle having two front turn signal lights, a source of electrical power, a turn signal switch in series with a flasher connected to said source, and an ignition circuit, a daytime running light system comprising: a relay in which a solenoid coil controls a double pole single throw (DPST) switch such that when the coil is activated, both poles are closed, a connection from the ignition circuit to said coil such that when the ignition circuit is in the "run" position, power is available to said coil, first means which prevents the coil from being activated whenever (a) the turn signal switch is on, or (b) the headlight switch is on, whereby the DPST switch is open, and which allows the coil to be activated when the turn signal switch and the headlight switch are both off, said first means comprising: a first transistor connected so that, when it is conducting, the coil is grounded through the collector and emitter of the first transistor, a second transistor connected to control the base of the first transistor such that, when the second transistor is conducting, the first transistor is non-conducting and the coil is de-activated to open the DPST switch, and further means by which the turning on of either the turn signal switch or the head light switch causes the second transistor to be conducting, and second means by which power can be fed through said DPST switch, when closed, to energize both signal lights simultaneously.