I have 1999 Honda Foreman 450 es that will start up no problem when battery charged. but if terminals left on battery it will drain down to dead. What coud cause this the stator or regulator?

Sudeep Chatterjee

• 3267 Answers
• Posted on May 26, 2009

SOURCE: battery wont charge more than 12.25 at 2000 rpm

Check the rectifier, its responsible for charging the battery when running, the fuse too, however the rectifier if it can not be repaired, better to buy a new one......................sodeep

SOURCE: not charging the battery as i ride 2002 dyna fxd

heck all connections especially the one thru the motor to the regulator-check battery to make sure levels are good and have it load tested

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: why is my 2006 street bob not charging

If the regulator was replaced and wasn't properly grounded it will not charge.