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[Datsun 1200 encyclopedia]

Alternator Wiring

From Datsun 1200 Club

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Categories: Charging System | Wiring

Early 1200 use Alternator with external Voltage regulator. Later 1200s (from 1981) use an Internally Regulated (IR) Alternator.

Contents

Overview

B110 alternator is 35A and has plastic cover on back
24375.jpgAlbum 24375

1980s 1200 is still 35A but uses internal regulator (IC REG)
24756.jpgAlbum 24756

Both use the same T-connector, but IC REG alternator socket is additionally notched
th_LRplug.jpg   th_FNplug.jpg

Datsun used the simple T-connector, but the NipponDenso C900 style can also be used. The locking tab prevents the connector from falling out.
C900.jpg

Early 1200

Our Datsun B110 used -- as with most 1964-1974 cars -- an Alternator with external Voltage regulator.

25445.jpgAlbum 25445

Alternator Connections
terminalColorLogical Connections
A (Alternator)W* To Battery + terminal through the Fusible Link
* To Regulator "A" terminal (W wire)
F (Field)WB* To Regulator "F" terminal
N (neutral point)Y* To Regulator "N" terminal
* To electric choke relay Y wire
E (Earth/ground)B* To body ground
* To Regulator "E" terminal
Alternator uses the typical 1970s T-shaped connector: 
F Field - stem of Tee
N Neutral point - head of Tee
Regulator Connections
terminalColorLogical Connections
A (Alternator)W* To Alternator "A" terminal (W)
F (Field)WB* To Alternator "F" terminal
N (neutral point)Y* To Alternator "N" terminal
* To electric choke relay Y wire
E (Earth)B* To body ground
* To Alternator "E" terminal
IG (ignition)WL* To fuse box "M" terminal (does not go through IGN switch)
L (Light)WR* To dash light "IGN" ('72, '73) or "CHG" (1971)

Voltage Regulator Pinout
1V1250_pinout.jpg

Wire Color
WR Lamp (to dash lamp)
 W Positive (12V from Fusible Link)
 Y Stator (Neutral point, tee-connector N)
 B Ground (Earth to horn bracket)
WB Field (Tee-connector F)
WL Ignition ('M' fuse)

Late-model Alternator

Datsun 1200 from 1981 (Japan-market models) use an internally-regulated Hitachi LR Alternator or equivalent. The LR135 has LS wiring like many modern Japanese alternators. The L-terminal goes to the CHG lamp, and the S-terminal goes to either IGN or straight to the battery.

24517.jpgAlbum 24517

24374.jpgAlbum 24374

Using in Older 1200

The LR135 is a bolt-in replacement for the LT135 BUT you must modify the wiring slightly.

See main article: IR Alternator Conversion Wiring

Engine Swaps

See main article: Basic Alternator Wiring

How the Alternator Dash Light Works

The dash lamp is connected to IGN +. The other side goes to the "L" terminal of either the external regulator or alternator. A relay turns the dash lamp on/off.

  • When the alternator is not putting out current, the "L" terminal is at ground/earth, so the dash light turns on
  • Once the alternator starts putting out current, the "L" terminal is at full voltage, so the light turns off (both sides of the light are at same voltage)
WARNING: If the dash lamp is burned out, the alternator does not work. The lamp circuit is used to start the alternator.

External Regulator

The dash lamp is connected to IGN +. The other side goes to the "L" terminal of the external regulator. A relay inside the Voltage Regulator turns the dash lamp on/off.

  • When the alternator is not putting out current, the "L" terminal is at '-' voltage, so the dash light turns on
  • Once the alternator starts putting out current, the "L" terminal is at + voltage, so the light turns off (both sides of the light are at +)

This also is connected to the F (field) connection of the alternator, so it "turns on" the alternator. It is the switched 12V (through the lamp) that kick starts the alternator fields.

Internal Regulator

Internally regulated Hitachi LR alternators (S-L type) use the L terminal to turn the dash lamp on and off, using a transistorized switch inside the alternator.

Automatic Choke Relay

On Datsuns equipped with an electric Automatic Choke, a relay is used so that the choke heater is activated only when the engine is running.

See main article: Electric Choke Wiring

 

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