Operation of immersion tube indicator for fuel gauge

47—715 Operation of immersion tube indicator for fuel gauge

With fuel level going down, the slide contact (1) on float (2) of immersion tube indicator increases the resistance value, the voltage will drop and the indi­cating needle in instrument will therefore swing back.

If the fuel level goes down still further, the reserve warning contact (5) in immersion tube indicator is closed and will connect reserve warning lamp to ground, which will then light up.

Immersion tube indicator

1    Slide contact

2    Float

3    Contact plate

4    Guide and contact rod

5    Reserve warning contact

The circuit has been modified starting September 1982. The reserve warning lamp will light up with ignition switched on (checkup). As soon as engine starts, the lamp will go out, if the fuel tank holds more than the reserve fuel.

Note: During checkup, the reserve warning lamp will light up weaker, with reserve stronger.

Model 1 23, 1 26 sedan and coupe up to August 1982

1     Immersion tube indicator

2    Fuel gauge

4 Cable connector tail lamp unit harness a To terminal 1 5

Model 123, 1 26 sedan and coupe starting September 1982

1     Immersion tube indicator

2    Fuel gauge

4 Cable connector tail lamp unit harness a To terminal 15 b To terminal 61

47.8-715/1 F3

On T-sedans the coupler of the immersion tube indi­cator is provided with a built-in compensating resistor 4.7 £1 (color rings yellow/purple/gold/gold), so that in spite of different fuel tanks the same indicating instru­ments can be used.

Model 1 23 T-sedan up to August 1 982

1     Immersion tube indicator

2    Fuel gauge

4    Cable connector tail lamp unit harness

5    Resistor 4.7 £2 a To terminal 1 5

Model 1 23 T-sedan starting September 1 982

1     Immersion tube indicator

2    Fuel gauge

4    Cable connector tail lamp unit harness

5    Resistor 4.7 fi a    To terminal 1 5 b    To terminal 61

Test fuel gauge (54-269).

47.8-715/2 F3