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Downtown 300 / DT 300 Battery warning light, bad rectifier?
« on: November 07, 2023, 06:08:25 PM »
Hey guys!
I left my Downtown 300i parked and couldn't started due to low battery. I took the battery to a shop to charge it and diagnose it, it was at 80% health, so I took it back to the scooter, started without problems and went for a ride, after 15 minutes the battery warning light came on.
I thought ok, maybe the battery is bad, it was 3 years old, so I bought a new one, went to another ride and again after 15/20 minutes the battery light came on.
I checked the manuals to test the chargin system and did the following tests:
1. Checked battery wiring, got voltage from battery and continuity test on the gound.
2. Checked resistance on the wires coming from the stator, got 0.4 between each of the 3 wires.
3. Checked continuity between the wires coming from the stator, no continuity.
4. Started the engine and check the AC current coming from the stator, got 24v on each of the 3 wires.
5. Check the battery voltage and got: 12.5v with the bike off, 13.2v with the engine at idle and 13.8v with the engine at 4000 rpm.
During the tests I had the engine running for around 20 minutes mostly in idle and the light didn't came on, but I don't trust it
The manual says that battery charging voltage should be between 14v and 15v, so I guess my issue is that my battery is not getting enough charge. I think since cabling seems good, stator seems to be generating those 24v and battery is new, the only thing left is the rectifier? What do you think?
I found similar posts here that seems to indicate the rectifier is the issue, but unfortunately rectifiers are quite expensive in my country so I don't want to spend the money if its not a good chance to fix it!
Thanks in advance!
I left my Downtown 300i parked and couldn't started due to low battery. I took the battery to a shop to charge it and diagnose it, it was at 80% health, so I took it back to the scooter, started without problems and went for a ride, after 15 minutes the battery warning light came on.
I thought ok, maybe the battery is bad, it was 3 years old, so I bought a new one, went to another ride and again after 15/20 minutes the battery light came on.
I checked the manuals to test the chargin system and did the following tests:
1. Checked battery wiring, got voltage from battery and continuity test on the gound.
2. Checked resistance on the wires coming from the stator, got 0.4 between each of the 3 wires.
3. Checked continuity between the wires coming from the stator, no continuity.
4. Started the engine and check the AC current coming from the stator, got 24v on each of the 3 wires.
5. Check the battery voltage and got: 12.5v with the bike off, 13.2v with the engine at idle and 13.8v with the engine at 4000 rpm.
During the tests I had the engine running for around 20 minutes mostly in idle and the light didn't came on, but I don't trust it
The manual says that battery charging voltage should be between 14v and 15v, so I guess my issue is that my battery is not getting enough charge. I think since cabling seems good, stator seems to be generating those 24v and battery is new, the only thing left is the rectifier? What do you think?
I found similar posts here that seems to indicate the rectifier is the issue, but unfortunately rectifiers are quite expensive in my country so I don't want to spend the money if its not a good chance to fix it!
Thanks in advance!