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Post by gregory on Jan 18, 2014 22:21:16 GMT -5
Hello, I have a 150cc Chinese scoot. It starts and runs fine but the headlights are very dim so I began troubleshooting to try to figure it out. Here is a video showing me taking some readings off the stator that just jump around like crazy. Video is 4:24.
I'm not an experienced mechanic and would like some advice as to what might be the problem. Thanks for the help!
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Post by carasdad on Jan 18, 2014 22:39:06 GMT -5
Instead of using the green ground wire from the harness connector..try placing your black lead on the frame or engine for a ground. If it gets better..the stator ground may be bad or loose. Try that and let us know..  |
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Post by tvnacman on Jan 19, 2014 5:02:07 GMT -5
I would like to say great video !!!!!!!!
I see the ground at 1o'clock on the fan cover goes to the frame with 2 other wires . I did not see where the negative wire from the battery connects . I see clear as day the ground connection between engine and frame , not where the battery is connected . I bet if you connected a jumper from the engine or frame to the negative battery things might change . If you read resistance on the green stator wire to the body of the stator should read 0 ohms . That being said there is no insulation on the body of the stator where it mounts to the engine . There are different configurations of stators , floating ground , others center tap , some come without the green wire .
As Carasdad said the green wire maybe the problem , touch to the engine and see what happens .
If you would like your welcome to call my number is in my banner .
John
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Post by gregory on Jan 24, 2014 16:55:04 GMT -5
Thanks tvnacman and carasdad for the advice. Your comments have spurred some ideas for troubleshooting that I will try this weekend. I'll let you know what I find out and hopefully we'll be that much closer to a solution. Have a great weekend!
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Post by gregory on Jan 26, 2014 21:26:22 GMT -5
Ok, here's what I did:
1. I conducted the same test but with the black lead of the multimeter to the negative terminal of the battery. Readings did not change. Same problem.
2. I then took the stator/pick up/flywheel from the good bike and put it on the bad bike. Same problem.
3. I then took the BAD stator/pick up/flywheel and put it on the good bike. I didn't get the jumpy readings but I got no readings from the yellow or white relative to ground. And the headlights did not work.
4. I then bench tested the stators. I had three. The original one off the "bad" bike. A newly purchased replacement for the "bad" bike. And the one off the "good" bike.
Resistance White to Ground Resistance Yellow to Ground
Original 0.5 ohms 0.4 ohms
Newly Purchased 0.0 (no reading) 0.0 (no reading)
From "good" bike 0.7 ohms 0.6 ohms
If you're interested here's a video showing what I did. Any insights? Thanks for your help!
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