Next thing I would do is clean every electrical connector related to battery and grounds with fine grit sand paper even though they may look good and are tight. It sounds like you have something causing excessive load. During cold weather metal parts shrink and it may be just enough that a suspect connector somewhere is making a poor connection.
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Check and repair both ends of the cables and any related cables/wires that require a screw/bolt/nut for connection.

 

Does your bike have automatic compression releases? If so they may not be functioning correctly.

 

After a week it hasn't done it since being serviced.

My best guess is it was do to a connection at the battery terminal. Things were tight but that doesnt always mean it was making a good connection.

Just thought I would update this if anyone has this problem in the future. Thanks for the help guys.

 

I had a similar situation....ended up being the negative power cable was just a tad loose...melted the lug on the battery before I figured it out....some blue loctite on a dyna's battery terminals is your friend!

 

If you rely on this bike as your transportation, then I would say "replace the battery at the first sign of deterioration." (Which you now have.)
www.batterymart.com

 

I've been having an intermittent "slow start" on my '13 FXDC, where the initial crank over was slow, but then the rest is back to normal. When this happens, the LCD on the dash changes from the Tach to the Odometer. I can switch it back, but not sure if my battery is getting low, and that's what's causing this, or what. If so, I can put my Battery Tender on it, but I don't normally, since I ride it every day, although my commute is only about 10-15 minutes each way. Is that part of the problem? That it's not getting enough charge to fully replenish the battery? If so, I guess I'll have to start putting it on the tender at night, at least once a week, or go for longer ride every weekend.

 

One thing I read about a year ago, is that our bikes take a bit more omph to get cranked over due to the the bigger bore and that others have used thicker battery cables to good effect.

 

Just my opinion that is enough to keep it charged. Put your voltage meter on the charger connections when you crank. If it drops much below 9.5 volts, your amperage on the battery is going south.. Probably need a battery. It will always get you a start coming off charger. Where it is going to die is when you are 10 miles from home and it sits a while.
Bet that low voltage at cranking is like flipping switches. It's not good on electronics.

 

Ok.... so anyone have any idea on the effects of barometric pressure on starting? I figure if the ACR's are meant to release some of the internal pressure to help it start (manual says 103s and 110s have it), that pressure has to have some sort of effect when it comes time to crank it.


I should note that I am currently in a geographical location that has very extreme pressure swings. Even called the Convergent Zone. The reason I'm wondering on it is it all started when a big weather change hit, the first of the season. Last year I didn't commute on my bike as much in the crappier weather. I'll check the local forum area and see if anyone else has the problem.

It did it again yesterday but yesterday we had a very major barometric change. Enough where it gave me a headache all day, then a massive headache by lunch, and I don't get headaches, basically ever. (A family member of mine got it too from the change).

But this morning, or yesterday when I stopped for gas, started within a second or two like it was new.

I'm not sure if the ACR's have anything do with it as I don't know much about them, or if it's just something to be expected from a big Harley engine. If it doesn't change it doesn't bother me, what I'm concerned about is it being a sign that something that could be covered by warranty is about to go out about 5 weeks before the end of my warranty. When I took it to the dealer they couldn't find anything (was nice weather). Been trying to get a video of it but no luck thus far. The barometric pressure change seems to be the only common ground.



I do have a Volomod on the bike, it flashes a 3rd brake light when stopped or stopping, but is otherwise off. Runs off the wires to a tail light. Been using it for years and on 2 other bikes. Think it's been on this bike for most of this year. Don't think it's the cause but I don't know how sensitive the ECU is and if something might be back tracking when I try to start... but again, it only started happening when the season changed, and not in the spring or anything.

 

I can't answer your question, but I can tell you that the pressure swings you experience from weather at a particular distance above sea level aren't any bigger than the swing from sea level to 5000 feet, so, if you can start at those two altitudes (LA and Denver, for example) then it shouldn't be causing you any problems.