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Contents |
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 [M.B.]
Pin 3 1972: BW
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, TEMP 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 T/S-R 4 ILL LAMPS LG ILL LAMPS GL ILL LAMPS GL ILL LAMPS GL ILL LAMPS 5 T/S-L GR T/S-L GR T/S-L GR T/S-L GR 6 CHG WR CHG WR IGN/CHG WR CHG WR 7 x x BRAKE YG BRAKE YG x x 8 12V G 12V G 12V YR 12V G 9 GAUGE, FUEL Y GAUGE, FUEL Y GAUGE, FUEL Y GAUGE, FUEL Y 10 GROUND B ? L BEAM RW BEAM RW 11 BEAM RW BEAM RW BEAM B BEAM RY 12 OIL YB OIL YB OIL YB OIL YL
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). See Fuel Gauge Wiring * Water temperature gauge. See Temperature Gauge Wiring
Indicator lamps (see "Dash Lights" below) * High beam indicator lamp (M.B.) * Left Turn Signal indicator lamp * Right Turn Signal indicator lamp
Warning lamps (see "Dash Lights" below) * Brake failure lamp (Japan GL & USA) * CHG/IGN failure lamp * Oil pressure indicator lamp
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 sender
See main articles: Fuel Gauge Wiring Temperature Gauge Wiring
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.
NOTE: For AUS-spec 1200s, twist the light switch bulb. This bright/dim function may be broken and only work in one position.
For Round Gauge dash, there are two bulbs in the Speedometer and one bulb in the center of the combo gauge.
Pin 4- Illumination Lamp circuit (12V supplied by Lighting Switch)
Master Beam Pilot Lamp
M.B. or BEAM light goes on when headlights are on and Dimmer Switch is flipped forward.
Ground Pin: various colors and wiring RY or B Supply Pin: various colors and wiring RW or See Meter Connector section above
One of the pins is 12V and one is Ground. With headlights on, check for both signals when switch is pushed forward. If there is no 12V, check the H fuse. With switch in Low Beam position both pins will be 12V unless the bulb is burned out.
Reference: Wiring Diagram Reference: Lamp Wiring
Ground
Illumination lights are earthed via the dash.
Warning lights and gauges are not earthed via dash, but instead through the wiring harness connector.
HOWEVER, When checking the dash illumination lights, cluster must be earthed by bolting to the dash frame.