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[Datsun 1200 encyclopedia]

Temperature Gauge

From Datsun 1200 Club

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Category: Wiring

Datsun 1200 comes with a full temperature gauge in the Cluster Gauge, controlled electrically by the Thermal transmitter (sender) that is screwed into the cylinder head.

Contents

Instrument Panel Gauge

The temperature gauge is part of the Cluster Gauge
26218.jpgAlbum click to view

Also see:
* Water Temperature Gauge in Instruments and Controls
* Radiator, section Temperature

Dash gauge. It is not unusual with any 10-year old stock radiator for the temperature to rise during summer. If you have this, don't panic. The engine can run all day close to the "H" mark. Just don't let it go over that.

Normal Temperature
19604.jpgAlbum click to view

According to Owner's Manual: Water Temperature Gauge, this is the normal range.

Normal Range
174_4c15ad181d4d8.jpg


Part Number

  • 24880-H1000 GAUGE-water temperature JDM [kaku]
  • 24880-H1000 GAUGE-water temperature B120 -7803
  • 24880-H1800 GAUGE-water temperature JDM [maru]
  • 24880-H1800 GAUGE-water temperature B120 7804-
  • 24880-H1800 GAUGE-WATER TEMP USA [round gauge]
  • 24880-H3100 GAUGE-water 1972 JDM


  • 24880-H5500 INDICATOR ASS'Y-water temperature JDM B210

Adjustment

25788.jpgAlbum click to view

Voltage Regulator

The instrument panel voltage regulator is integrated with the Temperature Gauge and is not sold separately. This regulates:

  • temperature gauge
  • fuel gauge

19519.jpgAlbum click to view


  • 24880-H1000 METER ASSY-WATER TEMPERATURE -7803
    • For round and rectangle gauge panels
  • 24880-H3100 Gauge W/temp 7804- $50.60 USD
    • also used by 620 truck 1972-1979

Thermal Transmitter

The temperature sender (sensor) is called the thermal transmitter. If varies resistance according to temperature.

Transmitter at right front corner of head
24849a.jpgAlbum click to view 12054.jpgAlbum click to view

25080-89900-1.jpg 25080-89900-1-1.jpg

ECU TEMPERATURE SENSOR

The late Sunny Truck has an ECU-controlled carburetor and uses a coolant temp sensor (in addition to the coolant temp sender for the guage).

22630-N4200 ENGINE COOLANT TEMPERATURE SENSOR $29 USD
* JAPAN C22 K.A15 JAPAN 1985-1991 (5-door high-roof)
* JAPAN B120 A12S 8910- [fitted to front of intake manifold]
* JAPAN B310 A14E EGI#EGR
* LD20/LD20T/LD28, CD17/CD20,E13S/E15S/E15E/E15T,RD28,MA10S,Y44E,SD33
* CA18E/CA18ET,L20/L20E/L28E,Z18E/Z20E,FJ20
Specs
* 19 mm hex
* M12 x 1.5 threads
* rectangle connector
22630-N4200.jpg
Most Fuel Injected Datsun-Nissan
RockAuto.com
* BECK/ARNLEY 1580135
* FOUR SEASONS 36422
* FOUR SEASONS 36413

Location on Late Sunny Truck
manifold-late.jpg

Wiring

Yellow/White wire connects to the Sender near the front of the cylinder head.
8122.jpgAlbum click to view

This YW wire goes straight to the Cluster Gauge connector. See: Instrument Panel Wiring.

Late Sunny Truck: Transmitter <--> Y/W/R engine harness <--> Y/W instrument harness <--> Dash Round Plug #1 <--> temp gauge <--> Instrument Panel Voltage Regulator

Regulator

The coolant/water temperature gauge incorporates a voltage regulator, which controls both fuel and water gauges.

  • If both the water and fuel gauges are off, suspect the regulator
  • If only one gauge is incorrect, suspect a bad connection, usually at the sender
See:  Fuel Gauge Wiring
See:  Temperature Gauge Wiring

Temperature Sender at cylinder head (on right side of head, at the very front):
8122.jpgAlbum click to view

Fuel Level Sender at fuel tank
24469.jpgAlbum click to view

Voltage Regulator is part of Temperature Gauge
19519.jpgAlbum click to view

Voltage Regulator Circuit in Cluster Gauge
13938B.jpg

Troubleshooting

First, clean the connections of the wire to the thermal transmitter (engine temp sensor).
15170.jpg27205.png
Yellow wire just about hose clamp
Remove the wire and clean the connector. Replace. Make sure the wire fits tight.

  • If both fuel and temperature gauges do not work at all, the fuse is likely burnt out. Inspect the fuse. If the fuse is good, the instrument panel voltage regulator may be bad
  • If both fuel gauge and temperature gauge read incorrectly (high or low) or fluctuate, the problem is likely the shared instrument panel voltage regulator. But first check the wiring connections. They may be loose or corroded.
  • If gauge reads MAX hot with ignition OFF, gauge is defective.
  • If gauge reads MAX hot with ignition ON, but cold with ignition OFF, transmitter is bad
  • Ground sensor wire at engine. If gauge fluctuates, gauge is bad


Accuracy Test

  • Buy a 20-ohm resistor at Radio Shack or other electronics store.
  1. At the engine, locate the thermal transmitter:
  2. Pull the wire off the transmitter and put a 20-ohm resistor from the wire to earth/ground
  3. Turn IGN switch to "ON". Gauge should read about halfway (straight up and down).

Nissan Electrical

From the 1973 Datsun 1200 Factory Service Manual.

Ohms  Temp
100   50C (122F) 

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