Tom_Veatch
Platinum Member
I've been following the similarly named thread and followed the advice therein, to wit, voltage measurements, etc.
So, for the Yanmar doctors/diagnosticians in the audience, the patient is a YM2220D with about 625 hours on the meter. To the untrained observer's eye, all the electrical components appear to be factory type. There do not appear to be any after-market or 3rd party components installed.
Patient complains of a charge light which is almost always on, but after a few minutes of operation, the light may go off. However, this is rare. Most of the time, estimated in excess of 90% of the time, regardless of engine RPM, the light shines brightly. If the light goes off, it has not been observed to come on again prior to engine shutdown.
Patient presents a voltage across the battery terminals with the charge light illuminated as follows:
So, for the Yanmar doctors/diagnosticians in the audience, the patient is a YM2220D with about 625 hours on the meter. To the untrained observer's eye, all the electrical components appear to be factory type. There do not appear to be any after-market or 3rd party components installed.
Patient complains of a charge light which is almost always on, but after a few minutes of operation, the light may go off. However, this is rare. Most of the time, estimated in excess of 90% of the time, regardless of engine RPM, the light shines brightly. If the light goes off, it has not been observed to come on again prior to engine shutdown.
Patient presents a voltage across the battery terminals with the charge light illuminated as follows:
- Engine Off: 12.6v
- 800 RPM: 13.4v
- 1500+ RPM: 14.3 to 14.6v
- An AC voltage exists at the output of the alternator.
- Charging current has not been measured.
- There has been no difficulties in starting. The battery has been adequately charged at each engine startup.
- Measurements have not been taken with the charge light extinguished as the opportunity has not presented itself.