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Old 08-29-2013, 04:16 PM   #1
Poway OP
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Massive Electrical Draw R1100GS. Sucks a good battery down to unusable in 8 hrs.

Hello ADV,
So I sold my 99 GS1100 to one of my best friends, 6 months ago. And now his bike has developed an issue.
My buddy takes his GS1100, (a 1 yr old Odessey battery, charged on a Odessey battery charger/ with a 100% charge, starts perfect) and rides into work. Eight hours later she doesn't start. He push starts her and rides home. The Odessey battery is brought to BMW/ Odessey dealer, and batt checks out as excellent. The GS1100 Altenator is putting out 13.94 volts, checked across pos and neg terminals at idle. Battery terminals have been cleaned (resturaunt standard, you could eat off them).
I'm thinking we've got a massive voltage draw, when bike is parked with the key removed. Any recommendation on how to proceed, would be greatly appreciated!!

Poway screwed with this post 08-30-2013 at 09:11 AM Reason: better model description
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Old 08-29-2013, 04:32 PM   #2
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CAN bus - no fuses?

---------------
Start by measuring the current draw when the bike is switched off. This is your base line measurement - you look for this current draw to be reduced towards 0.

Humm may be not ...

My estimate of present current draw .. say you have a 16 Amp Hour battery .. then in 8 hours it is drained .. so 2 amps is drawn out .. that is a lot of current ! 24 watts .. that will be warm to hot to touch.. So what ever it is will be warm...

First step - feel around for warmth .. be careful not to burn your hands! Feel things like the alternator, starter motor, EFI, voltage regulator, fuel pump, those relays... any black electrical boxes.

---------
If no joy there then revert to current measurement, unplug things until the current is dramatically reduced. Usually you'd expect currents of less than 10 milli Amps...
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Old 08-29-2013, 04:59 PM   #3
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Thank you. Great suggestion. Fuses only.
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Old 08-29-2013, 06:58 PM   #4
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Does he use the steering lock and if so does he accidentally leave the ignition turned to the park position with the park lights on? It's easy to not notice during the daylight since the headlight won't be on.
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Old 08-29-2013, 07:01 PM   #5
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Parking lights =

Rear 5 watts
Front 5 watts
Inst lights 3watts x 2

total 16 watts = 1.4 amps ... possible... good call, particularly on a 'new' to them bike.
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Old 08-29-2013, 07:21 PM   #6
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GS1100?



Jim
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Old 08-30-2013, 09:02 AM   #7
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1999 BMW R1100GS w 100,000 miles and climbing!

Thanks I'll double check how he's securing the bike. But, I'm pretty sure he's not using the steering lock.
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Old 08-30-2013, 10:10 AM   #8
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Another, "Wtf is wrong with my bike thread." In!!


Does he have a fuse block on the bike? I have a friend, no really I do, who got the switched and unswitched portions of his fuseblock backwards. It was draining his battery, but not as quick as your buddy's.
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Old 08-30-2013, 10:12 AM   #9
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Are you certain the starter isn't weak?

Id probably remove it, and check/test/clean it, if the battery+cables+alternator checked out.
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Old 08-30-2013, 11:10 AM   #10
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Disconnect the negative terminal of the battery and connect an ammeter in series there. Measure the current with the ignition off. If it's more than a few milliamps, something is wrong. Then, one-by-one, pull fuses and disconnect any accessories until the excessive current draw stops. Report back on your findings.

Note that there are a number of unfused circuits on the GS and it is possible that a problem with the wiring harness, ignition switch or even starter relay could be the source. Without the above test, you won't have any idea where to start.
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Old 08-30-2013, 12:18 PM   #11
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Starter is strong (like Bull) with a fresh charge.

I'll try the ammeter on the batt suggestion next. Thank you.
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Old 08-31-2013, 01:48 PM   #12
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Success!!!

Thank you slartidbartfast for sharing your method of trouble shooting. It led me to ID the powerlet fuse as the problem. It had a 22 amp draw. No wonder she drained so quickly.

Thanks again slartidbartfast!!
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Old 08-31-2013, 03:45 PM   #13
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Quote:
Originally Posted by Poway View Post
Thank you slartidbartfast for sharing your method of trouble shooting. It led me to ID the powerlet fuse as the problem. It had a 22 amp draw. No wonder she drained so quickly.
264 watts ... wow
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Old 09-01-2013, 12:13 AM   #14
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Quote:
Originally Posted by Poway View Post
Thank you slartidbartfast for sharing your method of trouble shooting. It led me to ID the powerlet fuse as the problem. It had a 22 amp draw. No wonder she drained so quickly.

Thanks again slartidbartfast!!
You are most welcome. Glad you found the problem.

Warin basically said the same thing but without giving a direct method.

22 Amps would fry most multimeters and wherever that current was going wouldd be burning up pretty quickly so I'm gonna guess it was actually 2.2A, which is also pretty much what Warin said.
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January 2010 New Zealand South Island ride
Summer 2009 UK to Alps ride
Summer 2008 UK End-to-End ride
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Old 09-01-2013, 08:22 AM   #15
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Now the question is: why is the Powerlet draining the battery??
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