Temperature Gauge
The temperature 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.
Testing
CAUTION
Make sure the voltage source is turned OFF be- fore connecting variable resistance to the elec- trical circuit to avoid electrical shock and to pre- vent damaging the gauge.
1.Connect temperature gauge to the variable resis- tance and DC voltage source (Fig. 46).
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. 47).
IMPORTANT: Allow circuit to warm up for at least 5 minutes before taking test readings.
A.Set variable resistance to 71 ohms. Apply a 14 + 0.01 VDC to the circuit. The needle should point to the middle of the green area (80oC).
B.Set variable resistance to 38 ohms. The needle should point between the green and red area (105oC).
3.Turn off the voltage source. Disconnect voltage source, gauge and variable resistance.
VARIABLE |
|
RESISTANCE |
|
14 VDC + 0.01 VDC | |
+ | |
Figure 46
1
2
|
| 3 |
|
| Figure 47 |
1. | Middle position | 3. Edge of glass cover |
2. | High temp. position |
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Electrical System | Page 5 | Groundsmaster |
