BATTERY

CONTACT MAKER

Fig. 76. Atwater Kent Wiring Diagram Type K-2

Setting and Timing the Unisparker.—The type K-2 unisparker is installed, so as to allow a small amount of angular movement or, in other words, the socket into which the unisparker fits is provided with a clamp which will permit it to be turned or locked in any given position.

Timing.—The piston in No. 1 cylinder is raised to high dead center between the compression and power stroke. Then loosen the clamp which holds the unisparker and turn the unisparker backward, or contrary to the direction of rotation until a click is heard. This click happens at the exact instant of the spark. Clamp the unisparker tight at this point being careful not to change its position. Note that current for this system is usually supplied by the starting and lighting battery. When changing batteries be sure that the voltage of the battery is the same as that marked on the coil.

To Plugs
To Plugs
Contact-
maker
SwitchContact Maker
BAT.
S & INT. INT. S.INT. INT.
COILSEC
Ground To Motor
Ground to MotorPOS NEG
BATTERY

Fig. 77. Atwater Kent K-2 Wiring—Cut 1, Under Hood Coil; Cut 2, Kick Switch Coil

The external wiring of the A-K type K-2 is very simple, as shown in the diagrams, [Figs. 77 and 77A]. Fig. 77 shows the wire connections, when the reversing switch and under-hood coil is used. Fig. 77A shows the connections, when using plate or kick switch coil. A well insulated braided primary wire is used for the primary or battery circuit. See that this wire is well protected against rubbing or abrasion wherever it comes into contact with metal parts of the car. When the starting and lighting battery is used to furnish the ignition current, two wires should run directly to the battery terminals.

The two types of Atwater Kent systems described are provided with automatic spark advance mechanism. Provisions are also made for manual lever control, by simply connecting the unisparker to the throttle lever at the base of the steering gear.