D RELAY 1. NORMALLY CLOSED Basically, an electrically operated switch which is normally closed (1) or open (2). Current flow through a small coil creates a magnetic field which either opens or closes an attached switch. 2. NORMALLY OPEN SPEAKER An electromechanical device which creates sound waves from current flow. SWITCH, MANUAL Opens and closes circuits, thereby stopping (1) or allowing (2) current flow. 1. NORMALLY OPEN 2. NORMALLY CLOSED RELAY, DOUBLE THROW A relay which passes current through one set of contacts or the other. RESISTOR An electrical component with a fixed resistance, placed in a circuit to reduce voltage to a specific value. SWITCH, DOUBLE THROW A switch which continuously passes current through one set of contacts or the other. RESISTOR, TAPPED A resistor which supplies two or more different non-adjustable resistance values. SWITCH, IGNITION A key operated switch with several positions which allow various circuits. Particularly the primary ignition circuit, to become operational. RESISTOR, VARIABLE or RHEOSTAT A controllable resistor with a variable rate of resistance. Also called a potentiometer or rheostat. SENSOR (Thermistor) A resistor which varies its resistance with temperature. SWITCH, WIPER PARK Automatically returns wipers to the stop position when the wiper switch is turned off. SENSOR, ANALOG SPEED Uses magnetic impulses to open and close a switch to create a signal for activation of other components. TRANSISTOR A solidstate device typically used as an electronic relay; stops or passes current depending on the applied voltage at "base" SHORT PIN Used to provide an unbroken connection within a junction block. WIRES 1. NOT CONNECTED Wires are always drawn as straight lines on wiring diagrams. Crossed wires (1) without a black dot at the junction are not joined; 2. SPLICED crossed wires (2) with a black dot at the junction are spliced (joined) connections. SOLENOID An electromagnetic coil which crestes a magnetic field upon current flow, to move a plunger, etc.