Fuel Gauge
The fuel gauge can be tested using a new gauge as a substitute or with the use of a DC voltage source and a variable resistance box (see Fuel Sender Testing in this section for additional information).
Testing
CAUTION
Make sure the voltage source is turned OFF be- fore connecting it to the electrical circuit to avoid electrical shock and prevent damaging the gauge.
1.Connect fuel gauge to the variable resistance and DC voltage source (Fig. 36).
NOTE: When reading the gauge test point, there are two white dots on the gauge face below the edge of the glass cover for each test point. For each variable resist- ance setting, the needle must be pointed between the two white dots.
2. Take test point readings (Fig. 37).
IMPORTANT: Allow circuit to warm up for at least 5 minutes before taking test readings.
A.Set variable resistance to 240 ohms. Apply a 14 + 0.01 VDC to the circuit. The needle should point to the left edge of the red area (empty).
B.Set variable resistance to 33 ohms. The needle should point to the right edge of the green area (full).
3.Turn off the voltage source. Disconnect voltage source, gauge and variable resistance.
VARIABLE |
|
RESISTANCE |
|
14 VDC + 0.01 VDC | |
+ | |
Figure 36
1 | 2 |
System
Electrical
3
|
| Figure 37 |
1. | Empty position | 3. Glass face edge |
2. | Full position |
|
Groundsmaster | Page 5 | Electrical System |
