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Messages - julio

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Downtown 300 / Re: DT 300 Battery warning light, bad rectifier?
« on: December 25, 2023, 02:16:42 PM »
Hola amigos!

Just wanted to post an update on my issue. Good news; it seems to be resolved!, I have been using the generic 20 amp rectifier and battery is charging without issues, so that's good!

Bad news; new problem appeared and I'm not sure what it is. When I was putting everything back together I plugged my underseat led light and it didn't worked, the cables were really hot and I unplugged it, I think the light was shorted.

Just after that, the met-in red light from the dashboard stopped working and the check engine light.. is not on, it's more like slightly illuminated.. it gets a bit more stronger when accelerating, it doesn't turn on completely, it is just a very dim yellow light only noticeable during nighttime, but I think something is not working ok there.. also I noticed that my blinkers seem to varies their speed with the engine idle, they get faster when I accelerate.

I think I might have introduced some kind of electrical problem, but hey, the battery is charging perfectly!!

Thanks for your help guys!!
 

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Downtown 300 / Re: DT 300 Battery warning light, bad rectifier?
« on: November 08, 2023, 07:26:42 PM »
Hola amigos!

Thanks again for all your help! I have updates!

So I got a rectifier a little bigger, 20 amp, it's a universal rectifier so I had to attach the connectors, but it was good enough for the test!

I connected everything started the bike and immediately got 14v on the rectifier and 14v on the battery with the engine idle! That's a lot better that the 13.2v I got with the old one. I did a test ride and everything seems to work, so I think the rec/reg was bad.

Based on your comments Ruffus, I think this would be just for testing, since the cooling element is smaller than the original and it's also only 20 amp.

I'm attaching some pictures of my test setup, please don't laugh at my connections, I used heat shrink tubing after taking the picture :p

I can't get the original from Kymco here. This one cost me 20 usd and one from the same brand but made for the Downtown costs 120 usd, it has a bigger cooling element and 35 amp.

One more time thanks for your help!

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Downtown 300 / Re: DT 300 Battery warning light, bad rectifier?
« on: November 07, 2023, 11:33:44 PM »
Hi Ruffus!

Thanks for the quick answer and help.

I checked all the connectors and they look really good, corrosion and burn free.

I was measuring the voltage directly from the battery and getting max 13.8v DC at 5000 rpm and 13.2v DC at idle. Tomorrow I will check directly from the connector from the reg/rec that goes to the battery.

I will also check the cable from the battery to ground and battery to starter.

I read on the threads you kindly shared with me that any regulator with 3 cables for the stator and 2 for the battery would work. Is that like from any motorcycle?

I can get one for like 20% of the price of the one from Kymco, it is 3-phases, 12v but only 12 amps, maybe is too small? Should I buy it at least to try it and see if it fix the issue and then buy the right one?

Again thanks for all the advise!

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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 :P

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!

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