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lildrumrboy



Joined: 19 Sep 2011
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Location: Jackson, MI - USA

PostPosted: Tue Sep 20, 2011 7:44 am    Post subject: Electrical System Woes Reply with quote

Okay, I've spent countless hours reading through old thread's, and just can't seem to find anything quite like the issue I'm having. So please forgive me if I'm rehashing an old topic...

I just purchased a 2006 JM Star/NST MPS-150T Touring bike, 120 miles on the odo. It drove great and had nice power on the trip home... almost. About two miles from my destination, I noticed the voltage meter simply dropped any reading whatsoever! A buddy following me said the bike lost all lights; no turn signals, brake lights, running lights, etc. Except that a single tail light simply stayed on continuously (bulb on the left-hand side of tail light), regardless of braking or signaling.

Upon reaching my destination I turned the key off and was told about the lighting issue. I immediately tried to start the bike again and, nothing. No clicks, no starter whine, nothing. That single tail light bulb comes on though. No horn, no headlights or turn signals.

I'm new to the wonderful lifestyle of scooter ownership (I know this is actually a motorcycle!) and could really use some direction on tracking down the issue. I've not yet tried to kick start the bike and see if it would fire, but that will be my first point of attention as soon as this rain let's up.

Does this sound like the regulator? Or possibly the CDI? I'll be going over the entire wiring harness and checking for blown fuses, chaffed wiring, etc as soon as I can. I would sure appreciate any input or ideas on what to look for first. This forum seems to be loaded with a great bunch of experienced folks!!
Thanks for your time,
Paul.



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ROE



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PostPosted: Tue Sep 20, 2011 8:57 am    Post subject: Reply with quote

With all the electrics dead it sounds like just the main fuse.
The single light working is strange though.
Whatever the fault turns out to be that one should be affected too
Unless it has been jerry-wired bypassing the fuse.. :D


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lildrumrboy



Joined: 19 Sep 2011
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Location: Jackson, MI - USA

PostPosted: Wed Sep 21, 2011 12:16 am    Post subject: Reply with quote

Okay, today I removed the entire body from the scoot to better inspect the wiring harness. The first thing I noticed was a green wire coming from the ignition switch that had pushed out of it's connector housing. Fixed that, and the scoot fired right up!

Horn and voltage meter are again working as well, but showing a low voltage reading (10.5 ish) while the scooter is running or not. I replaced every bulb but the headlights (EVERYTHING else was burned out!). Turn signals function as they should now. BUT, the headlights are extremely dim (both high and low beam) and the darn brake lights are both on constantly! Still not sure what is causing that. After driving the scoot for a couple miles round trip, the bike didn't want to turn over very easily. So I'm assuming the lights are running off the battery, as they also get brighter with the RPM's. Is this an indication that the regulator is bad??



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BigCheeseStick



Joined: 20 Aug 2011
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Location: Myrtle Beach

PostPosted: Wed Sep 21, 2011 3:46 am    Post subject: Reply with quote

Having that ground shorted out was a bad day in the life of your battery for sure. If it was permanently damaged is still at question. I wouldn't worry about he regulator. Its likely just that the battery needs to be put on a good charger and brought back up to full charge.

But this is a great example of why you see so many recommendations about pulling everything apart on a new scoot and inspecting (doing a PDI) as soon as you get it. There may be another short somewhere you've not yet found to.

Lots of people run into things like this and will curse and bash Chinese scooters over it... Lets not forget why we've bought them. And why they are what they are. Wink They just need a little extra eye on detail when new.



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lildrumrboy



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Location: Jackson, MI - USA

PostPosted: Wed Sep 21, 2011 6:17 am    Post subject: Reply with quote

Thank you for the input!!!

Would a weak battery cause the lights to run dim, and get brighter with higher revs though?

I JUST today found the sticky for checking the charging system Embarassed So I plan to pick up a multimeter tomorrow and run through that entire check list.

I gotta say... this forum is LOADED with ton's of helpful info, as well as helpful member's. It's just so much quicker to ask, as annoying as that can be to long-time member's, if only someone would have pointed me in the direction of that sticky Icon_lol5

I'll check back in on this thread with updates as I progress, and hopefully this thread may help someone else with the same problem!

Thanks again!



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lildrumrboy



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Location: Jackson, MI - USA

PostPosted: Wed Sep 21, 2011 6:30 am    Post subject: Reply with quote

BigCheeseStick wrote:
...
But this is a great example of why you see so many recommendations about pulling everything apart on a new scoot and inspecting (doing a PDI) as soon as you get it. There may be another short somewhere you've not yet found to.

Lots of people run into things like this and will curse and bash Chinese scooters over it... Lets not forget why we've bought them. And why they are what they are. Wink They just need a little extra eye on detail when new.

I couldn't agree more with the benefit of doing a PDI. Being a new scooter owner, just getting in there and seeing everything really helped me get familiar with the layout.
As far as another short somewhere, I'm stumped!! I removed as much of the wiring harness as I could and thoroughly inspected every inch of it. I couldn't find any evidence of arcing or burnt wiring or insulation. And the harness doesn't appear to have been hacked at all. No splices or anything that appeared unusual.

Chinese scoots are not much different than any other mode of personal transportation, in the respect that you get what you pay for; a little extra attention, along with proper maintenance, and we should enjoy many years and miles of enjoyment!

Ride on!



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BigCheeseStick



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PostPosted: Wed Sep 21, 2011 8:11 pm    Post subject: Reply with quote

lildrumrboy wrote:


Would a weak battery cause the lights to run dim, and get brighter with higher revs though?



Yup. If the battery is low and needing charge, or is damaged / failing and unable to hold full charge it may read 12+ volts, but when you put a load on it and amperage is needed it can't maintain. When you press the electric start button, if it's cranks over slow, after checking all the connections I'd be shopping for a new battery. The charging systems on these scoots doesn't leave much room for error, or added load. They charge enough to keep things going, but not much extra.



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lildrumrboy



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PostPosted: Sun Oct 09, 2011 1:32 am    Post subject: Reply with quote

Brake light problem: FIXED (sorta).

As I've learned what the issue usually is, the problem was at the front brake lever. I would assume there should be a spring of some sort within the plastic clip attaching the wiring to the lever itself. I took it apart very carefully and realized there is no spring to keep the brass pin/plunger in constant contact with the lever; I noticed when squeezing the lever that the pin/plunger was not moving with the lever, and thereby not allowing the pin to move in between the brass contacts of the switch.

No immediate way to remedy the issue (internal pieces missing), so I just disconnected the wires from the harness for the front brake lever. Applying the rear brake activates the brake lights as it should now, so all is well and safe until I can replace the switch at the lever.



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lildrumrboy



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PostPosted: Sun Oct 09, 2011 1:42 am    Post subject: Reply with quote

Headlights are still ridiculously dim. Unsafe to even drive at night, actually. High beam and low beam both. Yet, when I press the high beam "flash" button the headlights turn night into day!!

Now that the brake lights are not creating a constant draw on the electrical system, I will retest my charging circuit and see where to go from there. I'm off to put the trickle charger on the scoot so I'll have a freshly topped off battery to begin with.


Keep the leather in the wind, and the rubber on the road!



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ROE



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PostPosted: Sun Oct 09, 2011 12:10 pm    Post subject: Reply with quote

lildrumrboy wrote:
Headlights are still ridiculously dim. Unsafe to even drive at night, actually. High beam and low beam both. Yet, when I press the high beam "flash" button the headlights turn night into day!!


Obviously there's a high resistance somewhere in the part of the lighting circuit that includes both high and low beam but doesn't involve the flasher circuit.
You should be able to find it using a wiring diagram and a multimeter ?


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BigCheeseStick



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PostPosted: Sun Oct 09, 2011 2:23 pm    Post subject: Reply with quote

http://chinesescoots.forumwise.com/chinesescoots-thread16155.html



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ROE



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PostPosted: Sun Oct 09, 2011 3:46 pm    Post subject: Reply with quote

If you haven't used a multimeter before try this:
http://www.genebitsystems.com/david/MotorcycleElectrical/index.htm

!


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lildrumrboy



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PostPosted: Sun Oct 09, 2011 7:23 pm    Post subject: Reply with quote

Thank you both for the link's!! Very helpful indeed.

The wiring diagram is leaving me a bit confused though; when it comes to the High Beam flash circuit... confused as in I don't see it anywhere in the diagram! Laughing

The only thing in the diagram for "flash" or "flasher" is the 4-way hazard switch, and the flasher relay associated with it.

Also, none of my Instrument Cluster illumination light's are working (dash panel is completely blacked out) other than turn signal, and high beam indicators. I can't see my speedometer, volt meter, or fuel gauge at night! So this may be a hint as to what's going on with my head lights. Or yet another problem altogether. Shocked



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PostPosted: Sun Oct 09, 2011 7:51 pm    Post subject: Reply with quote

Sounds like an earth (ground) problem...


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BigCheeseStick



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PostPosted: Tue Oct 11, 2011 7:53 pm    Post subject: Reply with quote

ROE wrote:
Sounds like an earth (ground) problem...


+1 Easy to check to. Just use a strip of spare wire (pull some off your neighbors car. He won't mind Laughing ) put one end directly on the negative or "ground" bulb terminal, and the other on the head of any bolt going into the frame. Lights get brighter? = ground problem.



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