I have a 2015 sportster iron with 1500 miles. That being said the battery is draining over night. I found this to be a weird problem and i searched all over and not much info so i will see if anyonehas run into this before.

1) When i turn the bike off with the key leaving the switch on the right grip in the run position the bike is fine and the battery does not drain.

2) When i turn the bike off with the key and flipping the switch on the right grip to off the battery drains.

i have figured out that the Idle Air Control Valve continues to run when i do option 2 which in turn drains the battery. If i do option 1 and i then turn the switch on the right grip to off the IACV kicks in and starts to run even with everything off.

i was hoping someone has run into this and could shine some light on this issue. i went to harley to get a wiring diagram and that is laughable because there really wasnt one even in the service manual. could it be the switch or the body control module?? any help is appreciated.

hopefully i have worded this to make sense.

 

You can get the wiring diagrams for your bike at serviceinfo.harley-davidson.com
You will also be able to review any recalls/campaigns for your bike.

Have your VIN ready.

https://serviceinfo.harley-davidson....cle/lookupForm

I normally shut off the run switch and then turn the key off.
It may be that shutting the key off with the engine running does not allow the ECU to properly shut down.

 

It was a big problem on 2007s for a while. Pulling and cleaning all the fuses/relays, and using a bit of dielectric grease seemed to solve most of them. Corrosion/oxidation seemed to cause the IAC cycling wonkiness.

 

so if i am looking at the wiring diagram correctly the IACV is controlled by the ECM. so what could possibly tell the ecm to keep the IACV active? could it be a bad ECM?

 

I suspect that turning off the key does not allow the ECM to shut down properly. It says in the Owners Manual to turn the engine off with the run switch then turn off the key.

When the ECM detects the engine is not running it does a power down and stores the Adaptive Fuel info in the nvr ram.

Delphi Small Engine Management System Service Manual

Power Off: The controller will turn its power off when the ignition voltage: < 6.2
V DC. The controller prepares for entry into Power Down mode. The
preparation involves storing important information into EEPROM.

 

I'd do both. Turn off bike with switch first, and then key - common practice. Also, as Suba10jdl said... pull all the fuses and relays and clean them good. Put dielectric grease around the slots and put them back. Could be that one of the relays needs to be replaced.

 

Did you found any soloution, because i have the same Problem with my 2017 Iron 883 ?

 

Yep, same problem here. My solution was your #1 above. Just always leave the kill switch in the run position on the handlebar, and turn the bike off with the key. Just as easy to turn off, no cycling or draining of the battery, and i would always forget to turn the kill switch back on anyway which would give me a moment of frustration when going to start the bike and nothing happened.

Its a solution that works, and i would rather just ride it then go chasing an electrical gremlin that is known to be an issue on this bike