BMW K bikes (Bricks)

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1Back to top Go down    possible bad earth issues on Sun Oct 21, 2018 5:48 am

Georgej1000

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Hi all, I'm having some issues with the k bike. I'm charging up the battery after a winter in the shed, connect every thing up and she started on the first wind ( I love my k bike) however the next day i have to charge the battery up again. took it out of the shed for a short run round the yard and suddenly shes dead, no power and the battery seems to be flat again. but as i connect the charger to the battery in bike suddenly every thing comes back. so at first glance this is a bad earth. I have also put new brushes into and cleaned the starter motor so I don't think the issue is there. the earth strap to the seems to be fine so where else could i have earth problems?

look forward to the your suggestions

George

    

2Back to top Go down    Re: possible bad earth issues on Sun Oct 21, 2018 6:01 am

Two Wheels Better

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It might be a good idea to connect a voltmetre to the battery and to check the voltage at the battery's terminals after a full charge, then charger off/key on, then immediately afterwards, what the voltage of the battery drops to when the starter begins its spin when you press 'go'. Perhaps it's simply a weak cell in the battery, making the batttery appear healthy after a charge but revealing the weakness when a load is placed on it.


__________________________________________________
1987 K100RS, '93 K11/K12 hybrid 'Big Block', '09 K1300GT, '07 K1200R, '04 R1150RT, '95 R100 Mystic, '77 R75/7.
Have we accomplished half of what we dreamt we would? There may still be time.
    

3Back to top Go down    Re: possible bad earth issues on Sun Oct 21, 2018 6:04 am

73MOH

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you could try taking the kill switch (behind starter button) apart and drowning it in contact cleaner

edit.. reread your post... wont be that if you had no accessory power


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Paul
1986 K100 RS
1997 K1100LT
2005 KTM990sd
    

4Back to top Go down    Re: possible bad earth issues on Sun Oct 21, 2018 7:16 am

RicK G

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I would be testing the battery first of all it should read 12.6v after siting for 4 hours after the charger is removed and no less than 10.5 v when the starter is engaged. One other possibility is the ignition switch but my money is on the battery.


__________________________________________________
"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats." from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

5Back to top Go down    Re: possible bad earth issues on Sun Oct 21, 2018 10:50 am

duck

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Here in the US you can take the battery to an auto parts store and they will load test it for free.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

6Back to top Go down    Re: possible bad earth issues on Sun Oct 21, 2018 10:56 am

Point-Seven-five

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Your battery is probably shot. If you let it sit in the shed all winter with anything less than a full charge on it it will self discharge and then the plates will sulfate, accelerating the self discharge.

I have worked in a boatyard, and seen this problem every spring on dozens of improperly stored batteries. You can sort of make it look good, but it will never be reliable again.

Moral of this story, always put a FULL charge on your battery when you put into storage, and trickle charge for a day once a month during storage.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

7Back to top Go down    Re: possible bad earth issues on Sun Oct 21, 2018 9:48 pm

Dai

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What .75 says. If you store the bike for months at a time, one of these is a good idea:

http://www.oxford-shop.co.uk/cat267_1.htm

Hook it up and forget it. I've got one and it spends most of its time attached to the Bandit.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

8Back to top Go down    Re: possible bad earth issues on Mon Oct 22, 2018 8:46 am

92KK 84WW Olaf

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@Dai wrote:What .75 says. If you store the bike for months at a time, one of these is a good idea:

http://www.oxford-shop.co.uk/cat267_1.htm

Hook it up and forget it. I've got one and it spends most of its time attached to the Bandit.

Why not just keep riding it........! That's what happens when you have a K....


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 83,050 miles
    

9Back to top Go down    possible bad earth issues on Tue Oct 23, 2018 4:24 am

Georgej1000

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Hi Guys thanks for the reply's. I had the battery tested and it tested ok but as was mentioned that's not under load.
so today I put the battery back in after a good 12-14 charge all looked good until I hit the stater then all life was gone again.

one thing I forgot to mention was as I connect the positive terminal there is an audible click from the relay box under the tank. I'm fairly certain its the starter relay. now as I mentioned before ( I think) when I was having this problem I was using a test probe to try to track whats going on. when I touched the test probe to the input side of the starter relay i get light on the probe as you would expect , but on the negative side suddenly i have power back. suspecting a earth problem and reading another post here about the stater motor brushes being an issue, I changed them and the problem went away. but I still have a battery problem.

    

10Back to top Go down    Re: possible bad earth issues on Tue Oct 23, 2018 9:01 am

mike d


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How was the test performed. As Duck mentioned it should be a Load Test. In the UK many Tyre/Battery outlets will load test your battery FOC, on the basis that you will probably buy a new battery from them.

Mike

    

11Back to top Go down    Re: possible bad earth issues on Tue Oct 23, 2018 4:56 pm

Point-Seven-five

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Anything other than a load test on your battery is worthless. The worst battery will show a full voltage after time on a charger. The problem is that there is no real power being stored, and the voltage drops almost instantly when any current is removed from the battery.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

12Back to top Go down    Re: possible bad earth issues on Tue Oct 23, 2018 8:43 pm

indian036

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@Point-Seven-five wrote:Anything other than a load test on your battery is worthless. The worst battery will show a full voltage after time on a charger. The problem is that there is no real power being stored, and the voltage drops almost instantly when any current is removed from the battery.
Mostly true, but at the extreme worst, a battery I tested a couple of days ago showed 6.5V after a day and a half on a hefty charger. Funny, but it wouldn't deliver anything measurable on my load tester!

Smile

Bill


__________________________________________________
1985 K100RT VIN 0028991 My original Very Happy (Historic rego)
1985 K100RT VIN 0029036 BOB the Blue Old Bike (Historic rego)
1990 K100LT VIN 0190452 Work in progress
1984 K100RT VIN 0023022 Work needing lots of progress

1986 K100RT VIN 0090542 Work needing lots and lots of progress
1993 K1100LT VIN 0183046 Work in progress
1993 K75S VIN 0213045 Newest toy, slightly non-original
    

13Back to top Go down    Re: possible bad earth issues on Wed Oct 24, 2018 4:00 am

charlie99

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@indian036 wrote:
@Point-Seven-five wrote:Anything other than a load test on your battery is worthless. The worst battery will show a full voltage after time on a charger. The problem is that there is no real power being stored, and the voltage drops almost instantly when any current is removed from the battery.
Mostly true, but at the extreme worst, a battery I tested a couple of days ago showed 6.5V after a day and a half on a hefty charger. Funny, but it wouldn't deliver anything measurable on my load tester!

Smile

Bill



yep id say stuffed Bill


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

14Back to top Go down    Re: possible bad earth issues on Wed Oct 24, 2018 7:08 am

Dai

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It'll make a good paperweight. Maybe one for holding down a workshop manual?


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

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