Hot battery
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Stage II
Joined: Jun 2018
Posts: 2
Likes: 0
From: Indiana
Hot battery
Went for a ride today about 100 miles in 90+ temps. I noticed a little after half way that my battery seemed extremely hot. Just short of getting home my bike, 01 dyna lowrider, died. Was able to coast down hill into my driveway. Now brand new battery is dead. Anyone got any ideas?
Tourer
Joined: May 2018
Posts: 381
Likes: 122
From: Halifax, Nova Scotia
Your regulator/rectifier decided to stop all that regulating. Maybe it met a persuasive libertarian.
Hey you said ideas, not good ideas.
You say you just bought a battery, which may be related. If there was a problem in your charging system, it may have seemed that the battery was failing, when actually the charging system was failing.
Hey you said ideas, not good ideas.
You say you just bought a battery, which may be related. If there was a problem in your charging system, it may have seemed that the battery was failing, when actually the charging system was failing.
Cruiser
Joined: Apr 2017
Posts: 101
Likes: 13
From: Chicago
With all your good battery testers like your Schumachers
where you can test the batterys power under load when you hit the switch,
you can also test your voltage when it is running.
when you have it running throw the tester on it and it will tell you exactly how your voltage is.
If it is erratic or too low or too high.
change the regulator.
If your voltage regulator is fine.
your culprit should be your battery.
if you have a bad cell in your battery that will cause the battery to get extremely hot.
be careful when the battery is hot, it will be emiting sulfuric acid fumes from the overflow tube.
There is also a serious risk of the battery exploding when over charged.
So you could have just one problem which would be a bad battery,
or two problems your regulator which then ruined your battery.
On the positive side, the corrective actions are not too expensive and not difficult to do.
Good Luck
where you can test the batterys power under load when you hit the switch,
you can also test your voltage when it is running.
when you have it running throw the tester on it and it will tell you exactly how your voltage is.
If it is erratic or too low or too high.
change the regulator.
If your voltage regulator is fine.
your culprit should be your battery.
if you have a bad cell in your battery that will cause the battery to get extremely hot.
be careful when the battery is hot, it will be emiting sulfuric acid fumes from the overflow tube.
There is also a serious risk of the battery exploding when over charged.
So you could have just one problem which would be a bad battery,
or two problems your regulator which then ruined your battery.
On the positive side, the corrective actions are not too expensive and not difficult to do.
Good Luck
Last edited by Allfields; Jun 17, 2018 at 01:17 AM.
Supporter
Joined: Jan 2007
Posts: 15,788
Likes: 5,622
From: along the shore of Mishigami
Here's some other not so good news, a failed stator will take out the V/R then the V/R will take out the battery. Suggestion, take off the clutch cover (derby) if it smells burnt the the stator is toast. A better V/R is from Cycle Electric, they dump ground in a different way than the stock units do. There is a grounding wire on the V/R that has to go to the frame on a paint free connection. Charge up the battery get the bike running and do a voltage test across the battery while the bike is running. Idle around 13.2-3V and above 2200 rpms about 14.2V
Elite HDF Member
Joined: Sep 2008
Posts: 4,440
Likes: 148
From: Northwest
Or.. you can ohm out the stator. Unplug it up by the v/r, and check each phase to ground and to each other phase. Good thing to do is check your meter first ( if you have one ) determine what it thinks is a dead short by holding the leads together, then check the stator. Anything below about .5ohms is a dead short. You can also unplug the stator, start the bike and check for AC voltage. Don't remember when HD went to 3phase, I think the 01 is still a 2phase winding... and so is probably around 40vac (someone correct me). 3phase should be putting out about 36vac.
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