Sending Units (Resistance Check)
Most models have a combination temperature sending unit (a resistance sender and temperature switch). The smaller terminal is the resistance sender. Sending unit temperature values are stamped in the sender body.
Connect test resistor between sending unit wire and ground. Turn ignition on. Check gauge readings and compare to specifications in table. Remove sending unit and check resistance at position or temperature specified. If resistance is not to specifications, replace the sending unit.
COOLANT TEMP SENSOR RESISTANCE
| Part Number & Temperature °F (°C) | Resistance: K-Ohms (X) | |
|---|---|---|
| 0-280-130-023 | ||
| 68 (20) | 2.1-2.9 | |
| 176 (80) | .27-.4 | |
| 0-280-130-026 | ||
| 68 (20) | 2.2-2.7 | |
| 176 (80) | .3-.36 | |
COOLANT GAUGE RESISTANCE
| Model & Temperature °F (°C) | Resistance: Ohms (X) | |
|---|---|---|
| 325 Series | ||
| 105 (40) | 287 | |
| 140 (60) | 132 | |
| 151 (66) | 112 | |
| 158 (70) | 96 | |
| 176 (80) | 68 | |
| 198 (92) | 49 | |
| 216 (102) | 36 | |
| 249 (115) | 25 | |
| 262 (128) | 18 | |
| 5, 6, & 7 Series | ||
| 105 (40) | 287 | |
| 142 (61) | 127 | |
| 249 (115) | 25 | |
| 262 (128) | 18 | |
FUEL GAUGE RESISTANCE
| Gauge Reading | Resistance Ohms (X) | Needle Position (° From Horizontal) | |
|---|---|---|---|
| 325 Series | |||
| R | 71.7 | 0° | |
| 1/4 | 55.2 | 11° | |
| 1/2 | 30.1 | 42° | |
| 3/4 | 12.7 | 69° | |
| F | 3.2 | 82° | |
| 5, 6, & 7 Series | |||
| R | 71.7 | 0° | |
| 1/4 | 59.2 | 19° | |
| 1/2 | 25.7 | 56° | |
| 3/4 | 13.0 | 70.5° | |
| F | 3.2 | 82.5° | |