Marginal Voltage on '09 with Mosfet
Trying to diagnose a charging problem. Unusual symptoms here. Like there is barely enough to charge. IN 2-13 I had to replace my stater so I upgraded the R/R to the Mosfet at about 30k miles. With no extra load I should get over 14.1 volts. I have l all lights upgraded to LEDS. Anyway I checked the three wires off the stator and get 70 to 76 VAC. Checked the Mosfet FH020AA per Roadstercycles video and it look good. The no load voltage is 15 volts. However one test showed 4 volts at the leads which connect to he battery. Connected the voltage drops to about .2 volts above the battery voltage no mater the battery charge. The battery is 3 years old but get put n a tender one or twice a month. The bike at 63k miles on it now. Any ideas will be helpful. I have the battery charging and will be checking for rubbed wires and good grounds in the morning. It started this at the beginning of a 120 miles trip home Thursday night. Here is a short summary of my pucker trip. I attribute making it home to the LED light.
Coming home the other night I noticed voltmeter connected to the battery dropped from about 14V (GPS & Phone charging) to 12.3 volts. This was unusually and I was thinking my stater (OEM replacement in 2013) was going bad. I had to stop for gas. Inspected the battery connections and tighten them. I disconnected the USB charger for the phones and turned on the GPS connection to reduce the load. Lucky it started. Voltage still low. At 4500 rpm I got 12.8 volts. Above or below and the voltage dropped. Crank the throttle for a hard acceleration, or at least as hard as a 650 can, and the voltage dropped. Ah an Advance Auto. Stopped and borrowed a meter just in case mine was bad. Go out and started up . And 14.5 volts. Mine meter and the borrowed meter. Returned meter, bought a wire brush and cleaned the terminals. Started up and voltage is low. So headed and with fingers crossed. I have LED lights so figured the lower draw was helping. Noticed going though the rough road in Tappahanock Va at constant 4500 rpm the voltage dropped over the bumps. Almost stopped and bought a battery at the Walmart but kept going and made it home.
Vstrom 650 ABS
'07 Vulcan 900 LT