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Revision as of 08:00, 25 July 2011
Our Datsun B110 used -- as with most 1964-1974 cars -- an Alternator with external Voltage regulator.
Contents |
Overview
Alternator Connections
| terminal | Color | Logical Connections |
| A (Alternator) | WR or W | * To Battery + terminal through 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 |
Regulator Connections
| terminal | Color | Logical Connections |
| A (Alternator) | W | * To Alternator "A" terminal (WR or W) |
| F (Field) | WB | * To Alternator "F" terminal |
| N (nuetral 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 (72: W?) | * To fuse box "M" terminal (fused through to IG terminal of ignition switch) |
| L (Light) | WR | * To dash light "IGN" ('72, '73) or "CHG" (1971) |
How the Alternator Dash Light Works
The dash lamp is connected to IGN +. The other side goes to the "L" terminal of the external regulator.
- 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 +)
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. As soon as the choke heats up, it comes off the choke. If your engine is cold, you won't be able to restart it. For example, if you listen to the radio for a couple of minutes before starting the engine, and mistakenly put it to IGN, then the car won't start on a cold day.
To prevent this scenario, the relay only powers the choke when the engine is running. The alternator provides a signal when the engine is running. It is the Neutral Sense wire (N wire). This is a weak signal so a relay is used.
Alternator Upgrade
Many different Datsun alternators and alternators from other makes can easily be fitted to the Datsun 1200.
See main article: Alternator Upgrades