Ariens 936022 (Sierra 1340G) Service Manual download pdf (Page 44)

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the meter should move to open circuit (high

resistance). Check from each terminal to ground

(switch case). Meter should show open circuit (high

resistance).

Ignition Switch

NOTE:

Refer to the wiring diagram of the unit involved

to determine switch functions and test using the meth-

ods described.

The ignition switch incorporates a number of functions,

although not all functions are used on all equipment.

The switch has three positions: OFF, RUN, and a

momentary contact START position. Use an ohmmeter

to check the continuity of the switch in each position.

OFF Position

- Should be continuity between contacts

G and M. These connections ground the engine

magneto and stop the engine in the OFF position.

RUN Position

- Should be continuity between contacts

B and A. These connections supply power to the rest of

the wiring harness. Connections G and M open to each

other.

START Position

- Hold switch in START position while

testing. There should be continuity between contacts

S1 and S2. These connections apply power to close

the solenoid contacts and operate the starter motor.

In addition to the above test, place the switch in the run

position and check between each contact and ground

(metal case) to be sure no terminals are grounded. If

the switch is operating properly, there will be no

continuity between contacts other that those described.

11.5 SOLENOID AND RELAYS

Solenoid and relays are both magnetically operated

devices. Both devices operate on the principle that

passing a current of electricity through a coil of wire will

create a magnetic field strong enough to attract a piece

of iron or steel. Each device uses this principle in a

slightly different manner.

Relay

- A basic relay consists of a coil of wire wound

around a soft iron (magnetic) core. When current is

passed through the coil, the core is magnetized and

pulls down on a magnetic lever. The lever in turn is

attached to several switch contacts which open or

close other electrical circuits. In this fashion, a small

current can control one or more larger electrical

currents and actuate several other devices. In most

cases a relay contact moves only a fraction of an inch

and the magnetic pull is small.

Solenoid

- A basic solenoid consists of a coil of wire

wound around a hollow tube. A magnetic core slides

inside the tube. When current is passed through the

coil, the core is pulled into the solenoid with

considerable force. With proper design, a solenoid can

exert considerable force over a distance of several

inches. A solenoid can therefore, pull a lever, close a

heavy contact, or perform other jobs that require a

straight line pull.

If a relay or solenoid fails to operate, the cause may be

either electrical or mechanical.

To check electrically, connect a voltmeter across the

coil of the device and activate the circuit that operates

the relay or solenoid. If the meter indicates no voltage

is applied, the cause is in the control circuit.

If the meter indicates proper voltage across the coil but

the device does not function, remove the power,

disconnect the wiring and check the continuity of the

coil with an ohmmeter. The meter should indicate

resistance, in the order of 3 to 5 ohms, if the coil is

intact. A high resistance indicates an open coil and a

defective device.

There are also a number of mechanical problems that

may cause the problem.

OFF

RUN

START

Key Switch

(03602300)

Figure

87A

86 85

NOT ENERGIZED

87A

86 85

ENERGIZED

Relay

(03042800)

Figure

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Ariens 936022 (Sierra 1340G) Service Manual Page 44

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