Figure 8.37. Wiring diagram: Typical arrangement of starting system, charging system, cooling fan circuits, warning lights and instrument panel indicators - model 309.

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Conventional designations
- 6 Generator
- 10 Battery
- 11 Brake pad wear sensor
- 17 Coolant level indicator
- 28 Coolant temperature sensor
- 29 Cooling system thermal switch
- 30 Electric cooling fan motor
- 31 Cooling fan switch
- 55 Fuel level sensor
- 65 Handbrake warning light switch
- 81 Ignition switch
- 90 Instrument cluster
- 99 Low brake fluid level sensor
- 100 Low coolant level sensor
- 105 Oil pressure sensor
- 106 Oil pressure relay
- 115 Starter
- 120 TDC sensor
- 150 Switch (water in fuel)
- 151 Control unit (power supply)
- 152 Cooling Fan Relay
- 153 Relay "A" of the cooling fan
- 154 Relay "B" of the cooling fan
- 155 Glow Plugs
- 156 Pump shut-off solenoid
- 157 Pre-heater control unit
Note: Wires are not marked by color, but by letters or numbers located at both ends of the wire.
Legend for the instrument cluster (position 88)
- and Power supply +VE
- b "Earth"
- with Tachometer
- d Tachometer
- e Low battery warning light
- f Brake light indicator light
- g Low brake fluid level warning light
- h "Earth"
- i Turn signal lamp
- j Parking light indicator lamp
- k Low beam indicator light
- l Oil pressure gauge
- m High coolant temperature warning light
- n "Earth"
- o Coolant temperature gauge
- p Oil temperature gauge
- q Water in fuel warning light
- r Diagnostic warning light
- s "Earth"
- t Hours
- u Instrument panel lighting
- in "Earth"
- w Choke on indicator light
- x Power Supply +VE
- y Low coolant level warning light
- z Turn signal indicator light
- a1 Pre-heater indicator lamp
- a2 Low oil pressure warning light
- a3 Brake pad wear indicator light
- a4 High beam indicator light
- a5 Fuel level indicator
- a6 Low fuel level warning light
- a7 "Earth"
