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Revision as of 11:40, 21 April 2014

Overview

Also see: 
* Wiring Diagram
* Wiring Harness Instrument Panel Harness

NOTE:
* Manual vs Automatic harnesses differ 
* early harnesses were changed in April 1971
* RHD vs LHD differ
* Round-gauge harness differs from Square-gauge

Meter Connector

The Instrument Panel Harness uses this connector for the instrument panel (meter cluster):

Be aware that while all 1200s use this connector, the wiring actually differs from B110 round-gauge harnesses, B110 rectangle gauge, and B120 (ute) round-gauge connectors.

Early Round Gauge (Coupe, etc.)

Pin 3 1971: RY
Pin 3 1972: BW
PROBLEM: Diagram shows 13 wires, connector is only 12 wires. Because the Clock is not actually in the cluster, but on the cluster back there is a 12V out pin to attach to the external clock. This pin is not in the Round Connector.

Late Round Gauge (1979-1994)

620 intro USA - round gauge

Cluster Gauge USA

Round Gauge Cluster vs Rectangle Cluster

PROBLEM: indicator globes stay on, no IGN lights. Move right indicator, left indicator flashes. Signal to left and oil light flashes.

PROBLEM: Turn on the lights and smoke comes out.

If it smokes, it is not earthed properly. The cluster bolts to the dash metal frame. If you wish to temporarily work with it, jump a wire to the dash frame.

If you upgrade the rectangle cluster to round cluster, beware the wiring is different.

Some pins in the circular dash connector are different. Pop the pins of the connector and re-insert in the appropriate order.
Round Tachometer may be wired in series (differently from aftermarket tachometers) to the IGN circuit that's already under the dash (this is how the factory wired tachometers). Or in series with NEG side of coil if you wish to run wires from coil into cabin. Because the tachometer works by induction, it doesn't matter which side of the coil it is wired into.

Dash Changes for Sedan, Ute and Station Wagon

I think it take a skinny little screwdriver, like you use for watches/sunglasses. The ones that come in the cheap set of 5 in a plastic case at most '$2 shops'. Loosen the prongs pushing a screwdriver in the wire side of the connector, while pushing with a small allen key in the other side. I'm sure there are professional tools to do the same job, but you can do it for cheap if you apply a little patience.

dattodude's original information sheet:

Pinout

pin 1978 AUS (rec?)   late 1200         620 intro round    round SHOOEYS     round USA           NON-USA
1   GAUGE, TEMP  YW   GAUGE, TEMP  YW   GAUGE, TEMP   YW   GAUGE, TEMP  YW   GAUGE, FUEL  Y
2   GROUND       B    GROUND       B    GROUND        B    GROUND       B    GROUND       B
3   T/S-R        GB   T/S-R        GB   T/S-R         GB   T/S-R        GB   BEAM         RY/BW
4   ILL LAMPS    LG   ILL LAMPS    GL   ILL LAMPS     GL   ILL LAMPS    GL   OIL          YB
5   T/S-L        GR   T/S-L        GR   T/S-L         GR   T/S-L        GR   GAUGE, TEMP  YW
6   CHG          WR   CHG          WR   IGN/CHG       WR   CHG          WR   CLOCK 12V    L      BEAM
7   x            x    BRAKE        YG   BRAKE         YG   x            x    T/S-R        GB
8   12V          G    12V          G    12V           YR   12V          G    ILL LAMPS    GL
9   GAUGE, FUEL  Y    GAUGE, FUEL  Y    GAUGE, FUEL   Y    GAUGE, FUEL  Y    T/S-L        GR
10  GROUND       B    ?            L    BEAM          RW   BEAM         RW   IGN/CHG      WR     CHG
11  BEAM         RW   BEAM         RW   BEAM          B    BEAM         RY   BRAKE        YG     x
12  OIL          YB   OIL          YB   OIL           YB   OIL          YL   12V          G
                                                                             BEAM         RY/RW  CLOCK
                                                                             internally wired?

Speedometer

The speedometer has a light for use at night. See the lamp section.

1972 Facelift speedometer has special switch:

Speed Switch

Ute Amplifier Speed Switch

Amplifier for B120 ute Throttle Opener Assembly (see Emission Controls). It's only fitted to the Manual Transmission models.

The speed detecting switch is part of the speedometer assembly and is installed in the speedometer. The amplifier prevents damage to the speed detecting switch which actuate the throttle opener only when the car speed is above 10km/h. Pub No. SM6E-EMC0A0, Page EC-11

Switch has three wires. It looks as if, from these photos:

Red: Ground ? fits on round-side connector
Black: -- goes to Red wire coming out of top center of panel
Green: Unknown

Double-check before using.

USA Amplifier Speed Switch

USA model from 0772 use an amplifier speed switch.

25035-H7000 ASSY-AMPLIFIER SPEED SWITCH

Cluster

The cluster contains:

Gauges
- Fuel Gauge (Petrol/Gas gauge)
- Water temperature gauge
Indicator lamps (see "Troubleshooting Dash Lights" below)
- High beam indicator lamp (M.B.)
- Turn Signal indicator lamps
- Brake failure lamp
- CHG/IGN lamp
- Oil pressure indicator lamp (see "Troubleshooting Oil Light" below)
Optional
- Tachometer. See Tachometer Wiring
- Clock. See Clock Wiring

Gauges

The coolant/water temperature gauge incorporates a voltage regulator.

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 sensor
- Temp sensor at cylinder head (on right side of head, at the very front):
- Fuel sensor at fuel tank

Temperature Gauge

Y/W wire.

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

Fuel Gauge

Back at the Fuel tank, there is a single Yellow (Y) wire on the sender.

connects to Y wire in the main body harness
connects to Y wire in the dash wiring harness
connects to Y wire in the cluster connector

The sender is grounded through the tank body.

Troubleshooting Fuel Gauge

A non-working Fuel gauge is usually one of three things:

Bad 'sender' (sensor) which is in the fuel tank
Bad gauge in the dash
Bad wiring

Pull the Fuel sensor wire (Yellow) off at fuel tank
Ground/earth this wire
turn IGN switch on and observe gauge:
- Gauge still dead. It is not caused by fuel sender. Check for loose wiring, at back of dash, or at dash wiring harness connectors
- Gauge goes to Full. Bad sender

Sender Resistance Check
You can also check the Resistance of the sender. Remove Yellow wire and measure between terminal and bare metal of sender: It should read higher than 10 ohms, but less than 88 ohms. If it is higher or lower than this range, replace the Sender.

Sender Full-Range Test

Remove Fuel sender from tank. This is fairly easy with Sedan, or with ute after removing inspection cover from tray. Not easy with Coupe.
With wiring connected to sender, ground/earth the top of the sender to body ground (using a jumper wire)
- Float down, gauge should read below E
- Float up, gauge should read above F

The Fuel Tank Sender (fuel sensor) has a float, and as it rises and falls with the fuel level, it varies the electrical resistance (Ohms) of the sensor. As measured by club members, by moving the float up and down from stop to stop:

12 ohms fully up
88 ohms fully down
35 ohms half full (per Nissan Factory Service Manual)

Dash Lights

Dash lights are idiot lights and illumination lights.

Dash Lamps
- OIL
- CHG
- BRAKE
- M.B.
- Turn Signals (direction indicators)
- Illumination lights

Pre-start Check

These dash lights should light up when you turn the key to ON, before you start the car:

OIL pressure lamp
CHG lamp

Both should go out as soon as the engine is started.

These do NOT light up on the pre-start check:

Brake lamp
Beam/M.B. lamp

Troubleshooting Oil Light

The sensor for the Oil pressure lamp is on the fuel pump just above the oil filter (left side of A-series engine):

This pump has a T-connector added. The original oil pressure sensor is the spade connector pointing down. A fitting for a mechanical oil pressure gauge is on the other end of the T.

The sensor is an "idiot light". It simply connects the wire to ground when there is oil pressure. So before you start the engine (IGN key on), the Oil lamp bulb is connected to earth/ground through this switch and lights up. As soon as the engine starts and pressure builds, it disconnects the ground circuit so that lamp goes off.

If the lamp never lights up (IGN key on, engine not started):

Be sure the wire at the oil pump is connected to the connector
Pull it off and then on again to ensue it is tightly connected. If it is not, you can slightly crimp it with pliers to make it fit better

Check the lamp again. If it still doesn't come on:

Reach behind the dash and twist the bulb out. If it is burnt out, replace it

If the light comes on (IGN key on, engine not started), but does not go *off* when the engine starts:

Be sure the wire at the oil pump is connected to the spade connector. If it is off and lying against the engine or body is has a natural earth/ground and so won't work correctly

If that is not the problem:

Disconnect the wire at the pump. Place it where it doesn't touch metal. Test the light again (with IGN key on):
- Light is off: replace the sensor. One from most any Datsun model will fit.
- Light stays on: You've got an unusual problem with the wiring or dash gauge cluster

This test is for functionality of the light. You don't need to start the engine to test this. If the light checks out OK, but there is no pressure or you suspect so, see Lubrication System Diagnoses.

Troubleshooting Dash Lights

After more than 30 years, these sometimes don't work. Could be a burnt-out bulb, corroded contact, or broken wire (turn signal indicators use wires).

Testing dash lights

Cleaning dash light contacts

Clean the contacts with a pencil eraser, sandpaper, or electrical contact cleaner.

Illumination Lamps

The lamps should light when the Lighting Switch is in the Park or Headlamps position.

For AUS-spec 1200s, twist the light switch bulb. This bright/dim function may be broken.

Ground

Warning lights and gauges are not earthed via dash.

HOWEVER, When checking the dash illumination lights, cluster must be earthed by bolting to the dash frame.

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Instrument Panel Wiring