15.9 volts is not good...
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Stellar HDF Member
Joined: Sep 2020
Posts: 2,436
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From: Southeast
15.9 volts is not good...
Went out to go for a ride today, and the bike wouldn't start. Cranked real slowwww.
I hadn't ridden in a while, so I figured I'd toss the charger on it for a bit and try again. After a while, it started. I checked the battery, and it was charging 15,5v+. I figured that was due to the charging system coping with the dead-ish battery. Went for a short ride and checked the battery again with the engine running, still 15.8-9v right at the battery terminals.
I first thought of the regulator going south, but I also read something about the stator possibly shorting to ground, which could do the same. Just got back, so I'll be doing some more investigating before bolts start flying, but what has been y'all's experience?
Thanks in advance!
I hadn't ridden in a while, so I figured I'd toss the charger on it for a bit and try again. After a while, it started. I checked the battery, and it was charging 15,5v+. I figured that was due to the charging system coping with the dead-ish battery. Went for a short ride and checked the battery again with the engine running, still 15.8-9v right at the battery terminals.
I first thought of the regulator going south, but I also read something about the stator possibly shorting to ground, which could do the same. Just got back, so I'll be doing some more investigating before bolts start flying, but what has been y'all's experience?
Thanks in advance!
Seasoned HDF Member
Joined: Mar 2021
Posts: 18,464
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From: backwoods
Volt reg should regulate stator. So even if it was high, volt reg would restrict it.
When replacing volt reg you put meter on AC and check stator. Tev it it up to 4-5k shouldn't be around 80-100. 20-25 volts per 1k rpm.
I am not sure how a bad battery would cause voltage to go high on bike. Maybe on auto, but they have different style of charging system. Maybe I am wrong. Either way charge battery and see
When replacing volt reg you put meter on AC and check stator. Tev it it up to 4-5k shouldn't be around 80-100. 20-25 volts per 1k rpm.
I am not sure how a bad battery would cause voltage to go high on bike. Maybe on auto, but they have different style of charging system. Maybe I am wrong. Either way charge battery and see
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Stellar HDF Member
Joined: Sep 2020
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From: Southeast
So, it WAS the battery, just not the one we all might be thinking.....
Went back out to check on progress of ion-stuffin' the battery in the Heritage. Charger said 14.4v and charging at .01A. Done, I'd say...
So, I disconnects the battery lead and check the battery voltage -- 15.8 !!!!!! WTF!!!!????
Plug the charger back on it, a nice 14.4v.
I decided to take my trusty multimeter out to my truck and just check the voltage there. 15,8v ????!!!!! Apparently, the entire electrical world has gone to the metric system!
Then, I got smart and figured I'd check the battery in the meter. It's been so long, I wasn't even sure if it HAD a battery. It's digital, so of course it did.
Swapped the decade-and-a-half-old 9v battery with a new one (it's those square batteries with the goofy terminals on the same side, for those youngin's). First thing I did with the new battery? Check the OLD 9v battery; sure 'nuff, it only had about 6 voltages left in it. I took the not-so-new and improved meter out to the truck and can happily confirm that both my truck, and the motorcycle are fixed! 14.4 - 14.6v, just like you want 'em to be!
Thanks for the input, and I hope this yarn helps someone down the road to remember to change the battery in their meter, and maybe buy enough to do those smoke alarms as well.....
Seasoned HDF Member
Joined: Sep 2020
Posts: 8,158
Likes: 9,567
From: central NC
I have a neighbor who came back from a four month deployment. Bike was on a tender, but wouldnt start. Before he asked for my counsel he drove his truck to the dealer and bought a new battery. When he got back I walked over to take a lookyloo. It was the battery alright. In the fob.
We did end up installing that bike battery about 9 months later.
We did end up installing that bike battery about 9 months later.
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