Solenoid Switch

Solenoid switches are designed to close and open electrical circuits electro-magnetically. Switches of this type consist basically of contacts and a winding around a hollow cylinder containing a movable plunger. When the winding is energized by the battery through an external control circuit, the magnetism produced pulls the plunger into the coil. The contact disc attached to the plunger moves against two main switch contacts closing the circuit.

The solenoid switch individual parts are replaceable as shown in exploded view. Figure 5-4. The control circuit wire from handlebar starter button is connected to small terminal stud. Battery cable must be connected to the large, longest stud and starter motor cable is connected to the large, shorter stud. If cables are reversed, solenoid coils will remain in circuit and drain battery. See solenoid internal wiring diagram. Figure 5-6.

Since solenoid coil requires 12V to actuate plunger closing main switch contacts, use a 12-volt battery. Leads A and B are connected to terminals 1 and 2 (coil terminals) to actuate solenoid. A sharp click should be heard from the solenoid switch when making this connection. No click or a heavy spark at the terminals when connecting wires would indicate either an open or short in the solenoid winding and solenoid switch must be replaced. If the solenoid winding checks good and plunger does close main switch contacts, there is still a possibility contacts are badly burned or eroded and will not pass heavy current. (See Figure 5-6).

To test continuity on the main contacts, leave 12V leads connected to terminals 1 and 2, connect a test bulb of at least 21 CP (12 V) to terminals 1 and 3. A bright glow of the test bulb indicates main switch contacts are passing current.

1. Terminal cover M

2. Small terminal stud nut and lockwasher

3. Large terminal stud nut and lockwasher (2)

4. Bolt

13 12

5. Lockwasher

6. Spacer plate

8. Cap washer

9. Spring

0 0

Post a comment