Davesax36 said:
I pulled both ground bolts on the motor and checked them yesterday. Is there another place I need to investigate? I couldn't find a main frame ground bolt. I'll try to read up about the sense circuit.
For checking the charge system (Mx Manual pg 150) there are two connectors. The gray is at the coil and the black is at the reg. Look closely into each for evidence of heat, such as yellow or brown plastic, or slightly discolored pins. Heat is caused by resistance.
Hold the gray one flat so you are looking into the pins with the release on top, then think of the pins numbered left to right.
Record resistance for:
Positive test probe to pin 1 with negative to 2,
positive to pin 1 negative to pin 3,
positive to pin 2 negative to pin 3.
The resistances should be 0.112 - 0.168 ohms at 20C (68F)
Since we live so close together I know it's hot where you are. Resistance changes with temp.
Reconnect both connectors. The rectifier output should be charging 14 V at 5000 rpm.
While
I thought the max battery state was 14.8V the Mx Manual pg 144 says: "d. Charge the battery until the battery's charging voltage is 15 V."
Caveat: The above is from the 2010 Mx Manual I still have. While changes are possible, I can't remember or imagine any to the charging circuit. It'd be great if somebody with a Gen2 manual can chime in on whether there are different values.
And then there's always the good old Electrosport troubleshooting chart:
http://www.electrosport.com/media/pdf/fault-finding-diagram.pdf