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Re: I installed by mistake wrong polarity of battery
Does this scooter have electronics on it ? If it does then that is where you want to look. If it has electronic ignition you might have ruined the Module. Light bulbs will be okay. You will need a OHM meter and start checking out all the wiring and fuses (there should be more than one fuse) The charging system may have to be replaced too. Good luck to you
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You have reversed the polarity for the CPU in the ECM This causes problems with the program at best and at worst will require a new ECM. Use a scanner to see if the program will reset and if not have the ECM checked for operation. You may have to have the alternator checked as well as reversing polarity blows rectifier diodes.
It certainly sounds like you have damaged the control board. If you cranked it with reverse polarity, there is a good chance that you have rotor winding damage also. If not you still may have to flash the rotor windings to ensure a correct polarized field. That involves hooking a battery for a couple of seconds to the rotor brushes (with correct polarity) with rotor brush wires disconnected. Only do this if there is no output voltage after you replace the control boards. Bad mistake :)
Hard to say without make, year, and model-but check all fuses in the power distribution box under the hood- ignition, alternator fuse, etc.-all of them, the small ones and the maxi-fuses. All fuses are pretty cheap. If you still have nothing, you may need a wiring diagram to check for fusible links that would be power distributors right off or near the battery. Fusible links work much like a fuse, and most have been replaced by maxi-fuses, but many vehicles have both. If there is a designated main fuse, it should be in the distribution block or box under the hood.
reversed polarity,check fuses. check the system for burnt wires also ! Always hook up your battery terminals correctly, as the alternator may be damaged if the battery is hooked up backward. jump start car, if it will. there should be at least 13.7 to 14.2 volts at battery posts while its running. if alternator is ok.
check your fuses. there should be 2 fuse boxes. one under the hood the other on the side of the dash on the driver side. possibly under the dash on driver side. it could also be relay that cannot be checked they can only be replaced and hope for the best