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Temperature Gauge Test

CAUTION: DO NOT  connect sender wire directly to ground during test.
  1. Disconnect temperature sender wire from sending unit. Connect a 12-volt 3.4-watt test bulb between connector terminal and ground. Turn ignition switch to "ON" position. Bulb should flash and temperature gauge needle should deflect.
  2. If results are okay, remove thermosensor (sending unit) from engine block and place sending unit in hot 158°F (70°C) water. Resistance readings should be 90-117 ohms at 158°F (70°C) and 20-26 ohms at 239°F (115°C) on all models.
  3. Remove instrument cluster from instrument panel. Measure resistance between temperature gauge terminals at rear of cluster. See TEMPERATURE GAUGE RESISTANCE  . See Fig 1 to Fig 6 .
Fig 1: Colt Wagon Temperature Gauge Resistance Check Terminal ID
G90I01372
Fig 2: Raider Temperature Gauge Resistance Check Terminal ID
G103935
Fig 3: Colt Vista Temperature Gauge Resistance Check Terminal ID
G103936
Fig 4: Colt Temperature Gauge Resistance Check Terminal ID
G90C01374
Fig 5: Ram-50 Temperature Gauge Resistance Check Terminal ID
G103938
Fig 6: Conquest Temperature Gauge Resistance Check Terminal ID
G103939
TEMPERATURE GAUGE RESISTANCE

Application Terminals Resistance (Ohms)
Colt B-D 144-174
Colt C-D 68-82
Colt B-C 76-92
Colt Vista No. 1-No. 2 50-61
Colt Wagon 1-2 50-60
Conquest No. 1-No. 2 49-61
Raider No. 1-No. 2 55
Ram-50 7V-TU 49-61
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