What causes Jonway 250 scooter electrical short?
by Neal Geiger
(Georgetown, TX)
Jonway 250YY wiring digram
I purchased a Jonway 250YY scooter in December of 2010 through a web-based dealer many states away from me. Though I enjoy the vehicle's design and value, I continue to have small frustrating problems.
The most inconvenient is a short circuit that drains the battery while riding. Symptoms are: non-working gas gauge and water temperature gauge. Both gauges appear to be working normally when ignition switch is turned to the "on" position, but the instant the engine starts, they both fail.
The gas gauge zooms to the full position until the tank is near empty, then it appears to begin working correctly again. The water temp gauge drops to "cold" and will occasionally flutter when the throttle is revved.
On two occasions, when the battery was near dead (because of unrelated carburetor problems - I have installed 2 new carbs since purchasing) as I attempted to start the bike, the water gauge sometimes acts like a volt meter, flipping and showing drain on the system as I turned the starting motor.
I carefully studied the attached wiring diagram for weeks, then I removed all the body panels seeking a short, cross wire or bad ground. When I made sure the ground wires were well attached and I could not find a shorted out wire - I started to think it may be the CDI and/or MANOSTAT (regulator). These two significant electronic components happen to be on the same circuit as the gauges.
Anyone have a magic wand out there?
Neal - Georgetown, TX
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