Find the Regulator & unplug. Connect a AC volt meter to the 3 white wires at the connector that is unplugged from the reg. connecting the 2 red & black meter leads to ANY 2 white wires at the plug (colors don't matter with AC. Run the bike & rev up. You should have starting at about 30 volts ac Up to about 90 volts ac reved if the Stator is good. Now move the 2 meter leads to 2 more white connections & check again. Now you have one more pair of white connections to check. Should have the same 90 volts on any of the 3 pairs of whites (3 phases). If they are low, The startor inside the cover is burnt--Replace it. If good, Then the Regulator/Rectifier Unit that rectifies ac to dc & then regulates the output at 14 ~ 14.5 volts DC on the red & ground (Green or black or housing ground) to go to the battery is the only other part that is for charging. You can't test a regulator other than to see if you have 90 v AC going into it & the plugged in it should be showing 14 Volts DC at the battery terminals , Not just 12 volts. Make shure you have a fully charged GOOD battery before tests or the readings will all be off.
SOURCE: 2001 yamaha r6 keeps going dead! Stator,regulator or something?
you need to check for a short if its not that then it could be your altinator or a regulator box
SOURCE: Recently having problems with my 2000 Fatty not
First, take your battery somewhere and have it load tested. Fat Boys are tough on batteries as the battery sits in the "horseshoe" oil tank and is subjected to high temperatures due to the hot oil in the tank. Battery life is typically two years although I've seen some go longer and some not last that long. Have the battery tested before you start spending money.
To check the stator, you unplug the regulator at the engine case. Down inside the plug you'll see some electrical connectors. Connect a DVOM (digital volt ohm meter) to these connectors (one lead to eac pin) and put the meter in the 50 volt or higher range AC voltage. This is important that your meter be set to measure AC voltage because at this point, the voltage is indeed an Alternating Current voltage coming out of your alternator. Start the engine and bring it to a high idle. You should be reading over 20 volts AC. The book says that you should read 12-18 volts per 1000 engine RPM. If your engine is turning 2000 rpm, your meter should read 24-36 volts AC.
To test the regulator, first charge your battery to a full charge. Then connect your DVOM across the battery, red to positive, black to negative. Put the meter in the 20 volt DC range. Start the bike and bring it to a high idle. The voltage will start at somewhere around 12.5 volts and climb to about 14.5-15 volts. This would indicate that the regulator MAY be alright.
Now, have you changed any of the lights on your Fat Boy? I've seen people change and add lights to the point where their alternator could no longer put out the current necessary to handle the load. If this is the case, you may need a higher out charging system.
I don't know where you're located but $260 seems quite high for a voltage regulator.
SOURCE: Battery good, regulator good, stator good, battery won't charge
you have caused a wireing fult thats all, it likely to be a bad earth on the bars or you may have blown a fuse by shorting some thing out when you were doing the work start checking the wireing out with a meeter start from the regulator you should have volts from there back to the battery check for a main fuse as well
SOURCE: 1987 Shadow 700 charging problem
yes there is a couple of different ways to test these components,first you will need a voltmeter and the first test is an ohms (resistance) test unplug the stator and place the meter leads on the stator leads 1and 2 then 1and 3 then 3 and 2 should read between .2 and 2.5 ohms then do an insulation breakdown one lead to stator lead the other to ground should read OL or OFL if any reading stator is junk. Then test out put meter to ac-volts meter leads to stator leads start the bike should read 15-100 vac. Then as far as the reg/rec goes set meter to diode mode and place one meter lead to the power output and the other to the stator input side of the connector do this to all three wires and then rev. the meter leads and do again 0.3-0.8 forward bias OFL in rev. bias then place meter lead to ground wire on reg/rec and do the same test if you get readings in both forward and reverse bias the reg/rec is bad replace
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