hey my 120y has a external regulator and i want to install a internaly regulated alternator so i was wandering what has to be changed or do i just connect it up and leave the external regulator disconnected.

Thanks!

Two things:
1. Disconnect external regulator
2. Jump two wires from regulator connector to Alternator connector

See IR Alternator Conversion Wiring

Hey i was reading that the lucas 15 ac alternator is internaly regulated and i have one
But i realised the alternator on the T connection only has IND terminal
And not another one so will this still work by bypassing the external regulator with jumper wires

As my wiring harness has to wires in the T connection

Thanks

Datsun wiring harness has a T-connector for the alternator. Does your 120Y have something different? Maybe it's an aussie-built model.

You cannot plug a T-connector into an alternator with a different style connector.

Yer my aussy built one has just one connector
But my jap one has T connector

I put in a internal regulated lucas (aussy) and the t connector fits
But the alternator only has the top pin that goes into t connector
I tryed anyway and it wrks i didnt even jump the regulator wires
It charges at 13 somthing volts
Weird?

Thanks seems to br working for know

Does your dash CHG lamp work correctly? Goes on with key ON engine OFF, and as soon as engine starts goes out?

Lucas 15AC and Datsun alternators both use a T-connector. This means Japan-built and Australia-built 120Ys should have a T-connector in the wiring harness. But the wiring is different.

Lucas 15AC alternator: IND/lamp connection
Datsun FN alternator: No indicator/lamp connection

On a Datsun designed for the FN type alternator (basically all Japan-built Datsuns from 1970-1978), the external regulator provides the Lamp signal. Presumably a Australian-assembled B210 wiring harness for 15AC is wired slightly differently than a Japan-built B210. Maybe it came with a harness adapter where the regulator normally plugs in.