BMW K bikes (Bricks)

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1Back to top Go down    electrical on Mon Jul 18, 2016 2:07 am

Ken52

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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    Re: electrical on Mon Jul 18, 2016 3:00 am

duck

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


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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
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3Back to top Go down    Re: electrical on Mon Jul 18, 2016 4:16 am

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 Tue Jul 19, 2016 1:30 am; edited 1 time in total

    

4Back to top Go down    Re: electrical on Mon Jul 18, 2016 9:32 am

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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5Back to top Go down    Re: electrical on Mon Jul 18, 2016 11:42 am

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.


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Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

6Back to top Go down    Re: electrical on Mon Jul 18, 2016 8:04 pm

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 theirsupplies should be checked. Probably easier to use a meter to check this one and pull relays one at a time.


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1992 K100LT 0193214 101,000 miles
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