BMW K bikes (Bricks)


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1Back to top Go down   electrical Empty electrical Sun Jul 17, 2016 11:07 am

Ken52

Ken52
active member
active member
Another question my friends, I seem to be loosing my battery charge just sitting in the carport with the maintainer hooked up,it keeps kicking up at 95% and charging.
this is with a new heavy duty battery.
Is their any kind of electrical wire or contact that continuously uses power? this is what it acts like.
the main ground is tight and dirt free covered with electrical grease. Any Sugestions?  thanks.

    

2Back to top Go down   electrical Empty Re: electrical Sun Jul 17, 2016 12:00 pm

duck

duck
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The clock is always drawing power. Not a lot though.


__________________________________________________
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
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

3Back to top Go down   electrical Empty Re: electrical Sun Jul 17, 2016 1:16 pm

kennybob

kennybob
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There are 3 fuses that always have power, #3 feeds the clock and the flasher unit; #4 is usually a spare unless someone added something; #5 feeds the connector for anti-theft alarm unit and a connector for special equipment. 

In addition there is an always-hot leg on 3 relays:  fuel injection, start, and load shedder.

The feed wire to the key ignition switch is another always powered circuit.

And there is a direct line from the alternator to the battery + terminal.

If you have a 10 Amp current setting on your multimeter you could pull the positive cable off the battery and measure total current draw while the bike is sitting off.  If it reads less than 0.1 A then you could measure on the 100mA setting to get a better reading.  i would guess the clock is less than 40 mA.

If it reads more than 0.1 then something is draining the battery and you can pull relays and fuses one at a time to see which affects the current.

Maybe you have a worn battery that can't hold charge anymore.  But you said it is new--did you have to add the acid?  Did you charge it up after the acid, takes 16 to 20 hours at 1A charging--a trickle charger won't cut it...



Last edited by kennybob on Mon Jul 18, 2016 10:30 am; edited 1 time in total

    

4Back to top Go down   electrical Empty Re: electrical Sun Jul 17, 2016 6:32 pm

robmack

robmack
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kennybob wrote:... If it reads less than 0.1 A then you could measure on the 100mA setting to get a better reading.  i would guess the clock is less than 40 mA
Actually, it will be less accurate on the mA range. You're forgetting the burden voltage. The burden voltage is the drop across the shunt resistor which by the act of inserting the dmm into the circuit can significantly reduce the actual current flowing in the circuit. The burden voltage has more significance measuring low currents in low voltage circuits.


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Robert
1987 K75 @k75retro.blogspot.ca
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5Back to top Go down   electrical Empty Re: electrical Sun Jul 17, 2016 8:42 pm

Rick G

Rick G
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ABS units can develop a fault that causes battery drain and they usually throw up a 7 fault code when it happens.


__________________________________________________
"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 1999 K1100 LT with a Big Block 1200
    

6Back to top Go down   electrical Empty Re: electrical Mon Jul 18, 2016 5:04 am

92KK 84WW Olaf

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I have left the Ks parked for 6 weeks at a time in winter and no optimiser. Always been enough in the battery to power them up and start them on the starter. No heated grips though. The clock draw is really minimal.

I do know from other threads that diodes going bad in the alternator can cause a parasitic drain.

I have also come across a relay fault doing the same thing. The always live relays and their supplies should be checked. Probably easier to use a meter to check this one and pull relays one at a time.


__________________________________________________
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 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 48,061 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 61,190 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
    

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