BMW K bikes (Bricks)

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1Back to top Go down   Battery -- Odd Issue Empty Battery -- Odd Issue Tue Jun 15, 2021 3:47 am

Shep

Shep
Gold member
Gold member
Brand new battery (AJC ATX20L) from a Canadian Supplier called Battery Clerk.
Battery is 12 V, 18 Ah, CCA 270 A, AGM technology.
Installed in bike 1987 K100 RS, with no ABS and no alarm on bike. Charge topped up with NOCO charger.
Over three days 12.8 V drops to 12.3 V then on day four it is sitting at 10.5 volts! Used a Fluke meter to verify  the reading. Only load on battery would be the BMW digital clock and a digital Voltmeter readout plugged in to the 12 V outlet under the seat.
What am I missing?
Shep


__________________________________________________
Model        Production Date/Serial Number
K100RS      1984 July/ (F0040448)
K100RS      1986 Dec/ (H0142581)
    

2Back to top Go down   Battery -- Odd Issue Empty Re: Battery -- Odd Issue Tue Jun 15, 2021 3:51 am

BobT

BobT
Life time member
Life time member
Battery is a duff one. It should hold its charge for weeks. There is nothing on a stationary bike that would draw enough current to drain a battery like that. Even having ABS would make no difference.

    

3Back to top Go down   Battery -- Odd Issue Empty Re: Battery -- Odd Issue Tue Jun 15, 2021 7:14 am

Dai

Dai
Life time member
Life time member
What Bob says. It's screwed.


__________________________________________________
1983 K100 upgraded to K100RS spec, 1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

4Back to top Go down   Battery -- Odd Issue Empty Re: Battery -- Odd Issue Tue Jun 15, 2021 8:10 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Take it out of the bike and put a full 12.8v charge on it. Let it sit for a day and check the voltage. Then take it back to the dealer for a load test. That should tell the dealer if the battery is indeed toast.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

5Back to top Go down   Battery -- Odd Issue Empty Re: Battery -- Odd Issue Tue Jun 15, 2021 8:21 am

yamaguzzi

yamaguzzi
Life time member
Life time member
When fully charged  if you remove a terminal does it still drop in voltage while in the bike ? If so the battery is toast if not the problem is in the bike


__________________________________________________
1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://motoguzzi850t.blogspot.com/
    

6Back to top Go down   Battery -- Odd Issue Empty Re: Battery -- Odd Issue Tue Jun 15, 2021 8:27 am

BobT

BobT
Life time member
Life time member
@Point-Seven-five wrote:Take it out of the bike and put a full 12.8v charge on it.  Let it sit for a day and check the voltage.  Then take it back to the dealer for a load test.  That should tell the dealer if the battery is indeed toast.
Why? If you run the bike then it will put 14v or so into the battery and do the same.

    

7Back to top Go down   Battery -- Odd Issue Empty Re: Battery -- Odd Issue Tue Jun 15, 2021 1:21 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
The idea is to see if there is an internal short vs a parasitic load on the the bike that is pulling the battery down. Follow that with a load test at the battery store, and you have an excellent argument for a replacement battery.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

8Back to top Go down   Battery -- Odd Issue Empty Re: Battery -- Odd Issue Tue Jun 15, 2021 9:10 pm

92KK 84WW Olaf

avatar
Life time member
Life time member
No chance you fitted a permanently live USB outlet......?


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

9Back to top Go down   Battery -- Odd Issue Empty Re: Battery -- Odd Issue Tue Jun 15, 2021 9:15 pm

RicK G

RicK G
admin
admin
@BobT wrote:Battery is a duff one. It should hold its charge for weeks. There is nothing on a stationary bike that would draw enough current to drain a battery like that. Even having ABS would make no difference.
Having ABS can make a difference both my K1100 and my wife's K75 had faulty ABS and it was caused by leaky transistors and it was discharging the battery in about 5 days. If all is well then ABS or not there should not be a difference but most of these bikes are around 30 years and these type of electrical problems tend to surface after about 20 years.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

10Back to top Go down   Battery -- Odd Issue Empty Re: Battery -- Odd Issue Wed Jun 16, 2021 3:45 am

BobT

BobT
Life time member
Life time member
Are you saying that the ABS is drawing power when the ignition is switched off? Sounds like something is wrong there.

    

11Back to top Go down   Battery -- Odd Issue Empty Re: Battery -- Odd Issue Wed Jun 16, 2021 7:06 am

RicK G

RicK G
admin
admin
@BobT wrote:Are you saying that the ABS is drawing power when the ignition is switched off? Sounds like something is wrong there.
YES Bob that is what I am saying the ABS unit has switched and unswitched power so a leaky transistor can and will cause the battery to discharge.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

12Back to top Go down   Battery -- Odd Issue Empty Re: Battery -- Odd Issue Wed Jun 16, 2021 8:18 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Ummm... The OP's bike doesn't have ABS.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

13Back to top Go down   Battery -- Odd Issue Empty Re: Battery -- Odd Issue Wed Jun 16, 2021 8:34 am

RicK G

RicK G
admin
admin
@Point-Seven-five wrote:Ummm... The OP's bike doesn't have ABS.
Yes I realize that but I was responding to what Bob had said earlier. "Even having ABS would make no difference."


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

14Back to top Go down   Battery -- Odd Issue Empty Re: Battery -- Odd Issue Wed Jun 16, 2021 2:27 pm

gorio

gorio
Silver member
Silver member
A quick check by sticking a amp meter between the battery positive post and the positive cable/cables running to the bike will tell you if there is leakage with the key off. If there is you can then check fuse by fuse to isolate the circuit that has an issue.

Or at least that is what I do.


__________________________________________________
1992 K100rs 16v
1997 R1100rt
2006 R1200rt
Past lives
Kawasaki Concours
1976 BMW R90s
1975 Ducati 860gt
1992 Honda VFR750
1985 Honda VF750
1982 Kawasaki 750GPZ
1975 Norton 850 Commando
    

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