Basic Alternator Wiring

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There are three basic type of Datsun alternator, each with their own wiring system.

• 1960s Datsun Alternator (4-pin rectangular connector)
• 1970s Datsun Alternator (2-pin T-connector with external Regulator)
• 1980s Datsun Alternator (2-pin T-connector with Internal Regulator)

1960s Alternator

From the introduction of the Datsun with alternator (circa 1966), it used a Hitachi type with a 4-spade rectangular connector. As usual with Datsun there equivalent Mitsubishi-sourced versions too. This type was used by Datsun 1000, Datsun 411 and early Datsun 510, among others.

Large Wires 
* A to Fusible Link on positive battery cable (White wire)
* E to earthing point (Black wire to engine block)

Four-spade rectangular connector
(Datsun 1000 colors)
WB - to Regulator WB (12V always)
W - to Regulator W 12V IGN 
Y - to Regulator Y (nuetral wire for lamp relay)
B - to Regulator B (earth/ground)

1970s Alternator

From about 1970-1978 (in USA market), Hitachi type LT alternators were used. There were also equivalent Mitsubishi units which are interchangeable. These feature the famous 2-pin T-connector with external Regulator.

These use FN wiring. They have F and N cast into the back cover. An external Voltage regulator is required.

See main article: Alternator Wiring

NOTE: LT135 35A units have black plastic bits. The larger LT150 50A and LT160 60A units have no plastic parts

These are marked FN on the back. However, it is common with rebuilt units to have their cases sand-blasted, in which case the letters are often unreadable.

1980s Alternator

From about 1979 (in USA market), Hitachi type LR alternators were used. There were also equivalent Mitsubishi units which are interchangeable. These feature the famous 2-pin T-connector BUT use no external Regulator. They are internally regulated, which makes them more reliable as they use an IC (solid state) regulator.

These use LS wiring. Some has L and S cast into the back cover, but some are unmarked.

See main article: Hitachi_LR_Alternator#Wiring

Mixing and Matching

It is possible to use a different type alternator in your Datsun than what it was designed for. But you need to make slight modification to the wiring.

IR Alternator In Older Datsun

This is very do-able. Hitachi IR alternators are more reliable and sometimes less expensive.

Datsun With FN Harness

Fitting an internally-regulated alternator to a Datsun originally equipped with FN wiring is quite simple. It only requires two jumper wires.

For detailed information, see Hitachi_LR_Alternator#Wiring

Datsun With 4-pin Harness

Fitting an internally-regulated alternator to a Datsun originally equipped with FN wiring is quite simple. It only requires two jumper wires.

TBD

Older Alternator in Newer Datsun

For Datsuns originally fitted with internally-regulated alternators, it is not recommended to fit an older alternator, as the IR alternators are generally less expensive and more reliable.

You will need to create a sub-harness with wiring for an external voltage regulator. New Voltage Regulators in USA generally cost more than an internally-regulated Alternator!

TBD - request a writeup