yanmar ym 155

tsgtdan

Member
HEY guys its been awhile.
Question is, can someone point me to where I can see wiring details on altinator, not charging. I see the two wires coming out of altinator but they go into wiring bundle. I know they must go to a regulator somewhere. My manuals don't say anything about wiring. I have been messing with the starter, so I did go back and rechecked connections all appears correct.
yanmar ym155 2 cyl diesel engine
Thanks for any help.
Dan
 
Found this, appears to be for a ym155. It shows a "generator" but could be something lost in translation. It does show an external regulator. Can't tell from the diagram what the function of the regulator is, could be an internal ground field , or external.

If this appears to be the correct diagram, you can test the alternator. First, the red wire on the alt should be battery voltage. If not, there is a bad connection between the alt output and the battery.

If that checks good, disconnect the yellow wire from the alt. Start the engine, bring the RPM up. Use a jumper wire, go from the red (battery) wire to the terminal of the alt where the yellow wire was removed. See if it charges. If not, try going from the terminal where the yellow wire was disconnected to ground. If neither test causes the alternator to charge, there is a problem with the alternator.

If the alt checks good, next step is to find the regulator, check the connections per the drawing. If the connections are good, replace the regulator.

If you are not comfortable checking the alternator, or it checks bad, take it to an alternator/starter shop. They can check it out, repair it, or supply a replacement much cheaper than going to the dealer!

http://www.tractorbynet.com/forums/files/yanmar/85601d1189474286-ym155d-need-some-help-electrical-wiring_diagram-jpg
 

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