2008 Superglide...within last year had new stator, regulator, and battery installed, and keep a BatteryTender hooked up when not riding. Recently, after riding for couple of hours with my Gerbings jacket liner and gloves turned on, my battery light came on. I stopped for fuel. When re-starting engine, it just barely cranked fast enough to start, but once running, battery light was no longer on. Ideas?

 

Was everything fine before using the heated gear?

Even though you replaced the stator, voltage regulator and battery recently, I would do a systematic check of the battery and charging system.

First, check your battery cables for tightness at the battery and ground on the frame.

These 'Sticky' posts will help:
https://www.hdforums.com/forum/elect...sting-1-a.html

https://www.hdforums.com/forum/elect...sting-2-a.html

If all checks out, then it gets more difficult. Did you do any mods that involved removing, repairing or changing anything electrical? Any hint of electrical issues recently; blown fuses, erratic speedo, light issues, etc.?

You may have a parasitic drain, abraded wire that is grounded.

Start there and post back what you find. Other will chime in with helpful ideas.

 

Sounds like you are drawing more power from the electrical system than what it is designed for. Find out how many watts is standard. Add all the watts that is consumed by standard electrical components, include headlight (hi/lo beams), don't forget the electric fuel pump, now add up what your electrical gear wattage is, if it's close to max that could be some of your problem. Another factor is if you are tooling around town at slow speeds may not be giving you a deep charge. Rider magazine had an article on this subject, google it for the read.

 

While the charging systems checks are good if you have issues you really only need to voltage at the battery with the jacket and gloves connected. Your 08 superglide has a 3 phase charging system so it should be able to handle a jacket and gloves.. IIRC they are a few amps a piece.. Connected everything thing up and start the bike. Voltage should be above say 13 volts at 2000 RPM but hopefully they should be above 13v at idle..

If low, go through all connections.. Poor battery connections, bad cables, weak grounds can all limit the charging abilities. They can also cause a voltage drop between the battery and the rest of the system. The last issue I saw where all was looked good but still had issues was the battery cables. They are typically only crimped and the lug connections were not good. I removed the heat shrink from the lugs and soldered the ends. This corrected the issue. I thing the low voltage indicator is checked in the speedometer so power connections to from the maxi-fuse to ignition switch to the fuse block to the speedo need checking. If you added any lighting to increase load that wiring can have an effect.