SECTION 4. METERS AND SWITCHES

1.METERS

1.1 Removal a. Disconnect the cable from the negative post. b. Remove the philips screw which hold the meter panel and lift up the panel assembly a little b. Inspection

The generated pulses are converted into voltage output through a converter.Then the voltage is divided into three different phase coils through a IC circuit.The tachometer pointer is swung by the compound magnetic field generated by the three point.

-Tachometer a.Construction a.Construction

The allowable error of a tachometer reading is specified as shown on the table below.If the reading deviates from the specified value.replace the meter assembly.

An electric tachometer is employed along with a Tachosensor.The tach/hour meter converts engine revolutions to electric signals,which is sent to the tachometer.The tachometer displays the engine revolutions visually.The tachosensor generates 14 pulses per one engine revolution.

When the fuel tank is full,the float is at the top and has moved the variable resister to a position of least resistance.This feeds maximum current into the meter circuit and the pointer swings fully to the F position.Consequently when the fuel level in the tank is low,everything acts in reverse.

b.Inspection

-Fuel meter

Connect the fuel gauge to form a circuit with the resisters as shown Fig.10-6 and check to see if the gauge pointer swings to each position: F.1/2 and E by changing the resistance value. If it does not,change the gauge assembly.

Note:

1) Figures in parentheses are reference value

2) Inspect each position in order F to E

3) Read values in three minutes.

1.4.Thermometer a. Construction

This is the same moving magnet type meters as the fuel gauge.As the coolant temperature becomes higher,the resistance in the thermo unit(sensor) become lower,which results in more current to the meter circuit and swinging the meter pointer to the high temperature side on the scale.Of course,as the coolant temperature become lower,everything acts in reverse.

Fig.10-6

-Fuel

gauge sensor(variable resistor)

Check each resistance value with a tester at each float position as shown in Fig.10-7.if the measured values are deviated from respective specified values,replace the sensor assembly.

b. Inspection

Normally the thermometer resisters higher values as the coolant temperature rises after the engine is running.If it does not,check the wiring first.If the wiring is normal.Replace assembly.

2. STARTER SWITCH

(1) Removal a. Remove the dash cover(Upper) b. Remove the ring nut holding the starter switch using a conventional screw driver. c. Pull out the key switch as shown in Fig.10-8

(2) Inspection

a.The main switch circuit,switching positions, and terminals are as shown in the figures. Check the continuity across respective terminals referring to the switch circuit diagram. Replace a defective switch as an assembly

(3) Release the ring nut with a conventional screw drive(-) and remove the combination switch.

2) Inspection

Each switch circuit is as shown,so check each switch for a continuity across respective terminals with a tester.Replace a defective switch as an assembly.

3. COMBINATION SWITCH

1) Removal

(1)

(2)

*1 :Terminals

**2: Switching positions

4.

Fuses are installed in the main fuse box and one for the headlights.Three fusible links are installed to prevent the wiring from burning due to a short circuit.

The circuit has 8 blade type fuses in its wiring circuit.When a fuse has blown replace it with one of the same value.

Note:

Using a large capacity fuse or wire burn out the wiring system.

Use fuse tongs to replace fuses

8.Trailer socket

A hella’s 7-pin trailer socket is equipped as a standard equipment.Lamp on a trailer can be operated through the socket.

Note:

Lamp on the trailer should be of the same size or smaller than those on the trailer.

Earthed at upper upper tapped hole in the axle bracket A.