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Apr 13

Posts: 1

SDavies2013 says:

CG125 BRE alternator wiring

Hi  I have a CG125 BRE engine and i need to know where the  wires coming off the alternator go! The wires are: yellow, White and black with a white tracer. 

as i need to test if the alternator is working, before going ahead and fixing it up

Many thanks 


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  • Posted 2 years ago (08 April 2013 14:57)

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Mar 09

Posts: 8930

jaffa90 says:


Welcome Sam,what year is the engine and what`s a BRE?

Usually 3 wires from the alternator are the same colour and go to the regulator/rectifier for the whole bike to operate in D.C.,yours could be a yellow for the main lighting system in (A.C.),white for battery charging via reg/rec in (D.C.) for parking/pilot/brake lights and flashers and black/white for ignition/electronic ignition.

In any case the 3 wires should be A.C. ,you can do 3 checks of resistance (ohms) and 3 checks with engine running (up to 60v A.C.) by probing (1) yellow + white (2) white + black/white (3) black/white + yellow.

Have you a wiring diagram?  


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