Yanmar alternator connections

[greeny]

Hope someone can help me.
Engine is Yanmar 3ym20 with a hitachi LR 160 fitted.
Story is as follows:-
Red charging light on all the time.
Removed alternator and took it to be tested. Tested out ok.
Refitted to engine and light still on.
I disconnected the 2 wire plug at the rear and tested the blue/black wire (charging light wire) to earth and had a dead short. To cut a long story short I found the harness had rubbed through at the rear of the engine and was grounding thus putting the charge light on.
I repaired this and started to put the connections back onto the alternator again.
During this process a short connecting wire from the red/black plug connector to somewhere?? disintegrated in my hand. It turned out to be a diode and capacitor soldered in series. I now don't know where it should go to, either the main red battery connection or the black earth.
I assume that it's a filter of sorts but I don't want to guess where it should go - any help will be appreciated.
Regards
Greeny

 

[VicS]

YM Service manual at http://www.motoren.ath.cx/menus/yanmar.php

Wiring diagram ( p184) shows nothing that helps ! (There's a capacitor inside the alternator)

Capacitor is probably a suppressor, dont know about the diode.

I'd wire it as per the diagram. Worry about a suppressor if any need subsequently found.

 

[greeny]

Thanks Vic,
I'll go to the boat tomorrow and try again leaving the diode/capacitor off. I'd been looking at the drawings earlier but was unable to see anything that gave me a clue. The other thought I had was that it may be a surge protector but again can find no reference to it on the drawings or anywhere on the web.
Thanks for your help,
Greeny

 

[VicS]

The other thought I had was that it may be a surge protector

Ah maybe. I dont know enough about that sort of thing to comment but never noticed anything like it anywhere else.