Excess electrical problem

[beartracks]

I have a Baja SC50 scooter. Year 2004
It burned the Rectifier and sent excess AC to the bulbs and burned them out. I have replaced the rectifier but the excess AC still burns the bulbs out as soon as I increace the rpms. It shows 34V AC at the head and tailight sockets. Anybody ever had this problem???

Beartracks.

[Fox]

I'm no electrical wizard but I think maybe you need to look to see if you have a ballast resistor on the bike and replace it. You may not have one but if you do, it'll look something like this:

www.partsforscooters.com/151-72

Or this:

www.partsforscooters.com/164-54_GY6_Resistor

[Goosey]

After checking for what Fox said, or a diode,
www.scooterpartspro.com/diode-gy6-based-scooters-and-atvs-and-more.html
These things work like mini regulators to different curcuits. Not all scooters have these though, mine do not.
I would suspect the stator needs replacing if you don't find anything like that. In my case I had 2 different "new" stators that were putting out too much power, blew the lights, luckily the rectifier seems ok. If you replace the stator, look carefully at what you order, number of coils, and type of plugs, plus.
When I ordered a replacement stator, 8 coil, for 150cc, 3plug, 2 wire I got the one on the Left first'


It blew my headlight and tail lights out, the one on the right, same description, looks like the original down to the wire solder points, this one worked fine. So take note of the pictures as well as descriptions. Note the width on the ends of the coils are different, and the colored wires soldered at different coils.

[shakerdriver]

I'm having an electrical problem exactly like this on a buddy's scoot. I've tried to figure out where the resistor plugs in at and I can't find any loose wires anywhere. The resistor has 2 wires and looks just like this one but his is only a 50cc qmb139.
www.partsforscooters.com/164-54_GY6_Resistor
If theres nowhere to plug them in then what should I do to keep it from blowing bulbs? I'm not 100% sure if the stator's bad but I've got one in the garage that came off a scoot that didn't have these resistors so if I switch it out will that hurt anything?

[Goosey]

Hmm, I don't know, if the stator matches it'd be ok as far as that goes, but the resisters work in the curcuit like a regulator, if it was stock with those resisters you probably need to find where they go. None of my 150's have them. First time I had to troubleshoot blown bulbs the guys had me looking for resisters, any chance they were an ad on as an afterthought by someone who didn't know what else to do when the bulbs started blowing? Usually it isn't hard to find where a wire goes unless the part was moved. Only thing I could tell ya is you have a live and a ground, but not where they would normally go.

[reveeen]

I am nothing but a foolish old man........ the very first thing I would check would be my grounds. What I mean by "checking" is: pull the bolt(s) and clean up the mounting and connector sides with fine sandpaper (wiping clean with a rag), greasing (with plain old grease to slow corrosion), and re-mount. I would pay attention for any burning, or heat discoloration, and replace those connectors. I would too, make sure the metal regulator body was making a good ground at the mounting bolt(s).

If I still found excess voltage at my bulbs I, with the aid of a ohm meter, would check my stator for shorts between the "lighting section" and the "igniting section". Unplug your stator. You should have 4 wires coming out of your stator: a yellow, and white, going into a modular plug (your "lighting section") and two wires going into "bullet connectors" (your "igniting section"), of these two wires disregard the wire with blue in it (ignition trigger) it's the other one you want (various colors, should have red, or black, in it). This wire has high voltage to fire your coil (65V+) and with the ohm meter you want to check for any continuity between it and the yellow, or white, wires. If you see ANY continuity replace the stator. Your Baja scooter uses a specific type of stator, with an extra coil in the "igniting section" (makes for easier starts) and you should replace it with the same type (Scrappydog sells them).

A "5 wire stator" has a green wire. This green wire is simply a ground (where the 4 wire stator relies on a good engine to frame ground).