Need some electrical help. pic included....

[KA_PWRD_510]

ive been having some problems with the alternator on my KA-E datsun 510. i swear it was working fine for awhile and then all of the sudden it just stopped charging. ive taken it into the local parts store and its checked out fine according to their machines.

im pretty convinced its a wiring issue but anything i try is not working and i honestly dont even know where to begin when describing what i have but here goes....

my ground is hooked up and my BAT connection on the alt. is connected to the starter and that goes back to the battery. i think (not 100% sure) my problem lies in the 2 pin connector on the side of the alt. i dont know what those wires are suppose to be doing voltage wise and which way they are being hooked up because the car has never had the actual plastic clip just 2 spade connectors. i have a green and a yellow wire for that connection (maybe not factory colors). does anyone know where these are suppose to trace back to? are they suppose to be putting voltage out when the car is off/on? when i disconnect the wire from the BAT terminal and check it with my voltmeter while the car is running what should that be putting out? 12-14v? im not getting anything. does this alt need an exciting charge to get it going? where does that come from and go to?

i just dont know enough about the charging system and i have to many questions so i really need some help here and im hoping someone on here has the answers.

THANK YOU!

[OutToWinPAHC]

Well how it work is ground and batt but internally there is the regulator which requires 12V positive to work (from a keyed ignition source so it shuts off. So in that 2 wire plug connection on is ignition power to turn on the regulator. The second wire is also 12V+ from the cluster. If the output fails that 12V gets grounded out and completes the dash light circuit.

So with the car running make sure you have 12v+ on both wires of that plug.

[KA_PWRD_510]

cool good info. does it matter which spade the wires are connected to? which goes on top which go on bottom?

if im understanding correctly one needs to be constant on and one needs to switch off with the ignition. right?

[OutToWinPAHC]

Top is power from cluster, bottom is power from battery via relay.