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Topics - sjdannen

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Citycom 300 / Blowing Ignition Fuses
« on: August 17, 2019, 01:14:31 PM »
The Scooter started yesterday but pretty much died as soon as I started heading down the street.  I found that the ignition fuse was blown.
 Replacing the fuse and trying again immediately resulted in a blown fuse.  Searching through the forums has indicated that previous incidents have been because of relay wires resting on exhaust pipe or other issues.  I hoped that was my case but apparently not.

If I replace the ignition fuse while the key is off, the gauges will self test and then turn off.  If I turn the key to the On position (with the kick stand up), the fuse blows.  Using a 10+ Amp ammeter in line with the fuse proved the best way to troubleshoot without going through hundreds of fuses.  I disconnected the coil, same result, disconnected the fuel pump, same result.  After taking off a lot more tupperware, I found that the high current draw didn't happen if I disconnected the relay behind the headlight marked "Power relay".  It seems that the wire with color "red with silver dots" that goes to the relay is constant power and the "Red with yellow stripe" wire is what is powered when the relay is closed.  Trying find a legible schematic was proving to be impossible so I just started looking at every wire for a red with yellow stripe.  Low and behold, there is one going to the ECU.  If I replace the Power Relay but disconnect the ECU, no high current draw across the Ignition Fuse.

Do I have a bad ECU? Or could the short be something else attached to the ECU and the high current is just passing through?

Thanks in advance for any ideas.  My two car garage is covered with parts taken off this scooter, but at least removing everything eliminated headlights and tail lights from the puzzle.

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