Battery Tender - BMW Luxury Touring Community
 
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post #1 of 20 Old Nov 27th, 2011, 3:57 pm Thread Starter
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Battery Tender

Hi all. To start let me say that I have searched the forum for an answer to this problem and have not found an answer. I have a 2002 Klt and the BMW Advanced Battery Charging System. It only has the plug adapter to plug into the outlet by the left foot peg. I have had it plugged in and now my battery is dead. I realize now that the blinking red light indicates that there is not connection to the battery, not that it is charging. Does anyone have any suggestions as to how to troubleshoot if the outlet is bad or the charger is bad. Also I would like to purchase the battery terminal alligator style clips which I believe can be switched with the plug adapter which is now connected to the charger.

Rich
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post #2 of 20 Old Nov 27th, 2011, 4:09 pm
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Re: Battery Tender

Here's what I would do.

First check that your battery really is dead - put a multimeter on it to see if it's got 12V or completely dead.

If it's dead, hook a battery charger directly to the battery (red to red, black to black), check for good connection, have it switched on. Then get a multimeter in a voltage range that will register 12V, and touch the red probe to the inside center (the positive) of the power plug near the left knee tupperware, and the black probe to the metal around the inside of the same plug. You're testing to see if there's 12V at that plug. If there's not, that plug is not connected. If there is nothing, my guess is that the wires may not be connected for some reason right behind the plug, which can be seen by removing the black bumper and chrome strip on that side.

If the battery is not dead, just do the multimeter probe check on he plug looking for 12V.

Hope this helps.

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post #3 of 20 Old Nov 27th, 2011, 6:44 pm
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Re: Battery Tender

Clean the contacts on the plug and in the jack.

Insert the plug and remove it a few times, then see if it is making a good connection.

Bob

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post #4 of 20 Old Nov 27th, 2011, 6:57 pm
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Re: Battery Tender

Rich just a note, the BMW charger will auto shutdown for self preservation if the battery is below a certain voltage. It would just sit there all day and do nothing. If that is the case you would need a dumb charger to charge it up then you could finish with the bmw charger.

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post #5 of 20 Old Nov 27th, 2011, 7:10 pm
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Re: Battery Tender13

I had the same problem this past summer. The battery tender showed a green light however when I tried to start her, nothing. This was puzzling to me since I knew the battery was only 13 months old. I also blamed the tender or the plug connection. As someone else suggested I also checked the battery with a meter. Yep my 13 month was dead.

Last edited by edmann; Nov 27th, 2011 at 7:14 pm. Reason: mispelled words
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post #6 of 20 Old Nov 27th, 2011, 8:00 pm
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Re: Battery Tender

Isn't the left foot peg power outlet switched?
I recall reading a procedure using the BMW charger to activate the charger before shutting off the key.

but I could be imagining things.....

btw, if you're checking the outlet for power, the center electrode is +, the sides are the return and be careful not to short them together with the multimeter probes.

Dave
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post #7 of 20 Old Nov 27th, 2011, 8:04 pm
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Re: Battery Tender

Powerlet by left foot is not switched. I plug my Tender Jr. into it all the time.

Chris Ehlbeck
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post #8 of 20 Old Nov 28th, 2011, 9:44 am
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Re: Battery Tender

Quote:
Originally Posted by blueknightga6
Powerlet by left foot is not switched. I plug my Tender Jr. into it all the time.
Same here.

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post #9 of 20 Old Nov 28th, 2011, 9:49 am
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Re: Battery Tender

take the plug end of the tender apart and check for broken wire caused by pulling plug out by the wire, I had the same indications earlier this week and the cause was the wire was broken from the terminal inside the plug.

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post #10 of 20 Old Nov 28th, 2011, 4:17 pm
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Wink Re: Battery Tender

+1! I had this happen to the Powerlet plug on my Tender, and it is an easy fix. If the light is blinking (red) it indicates an open circuit.

John
Quote:
Originally Posted by theoldone
take the plug end of the tender apart and check for broken wire caused by pulling plug out by the wire, I had the same indications earlier this week and the cause was the wire was broken from the terminal inside the plug.

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post #11 of 20 Old Nov 28th, 2011, 4:44 pm Thread Starter
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Re: Battery Tender

Thanks for the advice. I disconnected the battery to prevent further drain and accidentally touched something and got a spark, so I think the battery is still salvagable. I looked into the outlet by the left footpeg and it looks corroded, so that is probably the culprit. I will clean that, charge the battery with a different charger and test the outlet. Hopefully just a simple corrosion issue.

Rich
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post #12 of 20 Old Nov 28th, 2011, 4:56 pm Thread Starter
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Re: Battery Tender

It may sound silly, but can anyone give me suggestions on the best way to clean the corrosion out of the outlet. Small wire brush, emory cloth or a battery terminal wire brush. Dont want to cause any further damage.

Thanks Rich.

Rich
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post #13 of 20 Old Nov 28th, 2011, 5:48 pm
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Re: Battery Tender

Rich,

Never worked on this part but my experience with electrical connections especially ones that carry low voltage and high currents tells me you would be better served to replace it than try to clean it.

This part is harder metal than a something like battery terminal ( lead or copper ) and would have lost it's conductive coating due to the corrosion and no amount of cleaning will be a better long term fix than just replacing it.

John Baker

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post #14 of 20 Old Nov 28th, 2011, 5:56 pm
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Re: Battery Tender

Likely true.

I would use fine grit Emery cloth rolled into a tube and a little WD40 to make stuff slide. Clean the debris out carefully and coat the inside with a thin film of dielectric grease. Should get you going


Loren


Quote:
Originally Posted by johnbaker15
Rich,

Never worked on this part but my experience with electrical connections especially ones that carry low voltage and high currents tells me you would be better served to replace it than try to clean it.

This part is harder metal than a something like battery terminal ( lead or copper ) and would have lost it's conductive coating due to the corrosion and no amount of cleaning will be a better long term fix than just replacing it.

WAK1200LT
Loren

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post #15 of 20 Old Nov 28th, 2011, 8:57 pm
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Re: Battery Tender

I used a can of battery terminal cleaner that I got fro Autozone for a couple of dollars as mine was a bit corroded as well. It worked great and the plug works perfectly now.

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post #16 of 20 Old Nov 28th, 2011, 10:10 pm Thread Starter
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Re: Battery Tender

Thanks for the advice. I will try to clean it and if it doesn't look like new I will replace it to avoid any possible electrical problems. Just looked up the price for replacing the outlet and it's not too bad, but installing it is scary if I have to remove any tuperware.

Rich
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post #17 of 20 Old Nov 29th, 2011, 8:49 am
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Re: Battery Tender

Quote:
Originally Posted by theoldone
take the plug end of the tender apart and check for broken wire caused by pulling plug out by the wire, I had the same indications earlier this week and the cause was the wire was broken from the terminal inside the plug.
I've had the exact same thing happen also. The wires are held onto the connector by screws. One of the wires had come loose. The screw was fairly loose so I just tightened everything up and all was well.

I added a picture. Check the screws marked by the arrows, especially the one on the left.
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Chris Ehlbeck
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2014 BMW R1200RT Quartz Blue Metallic

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Last edited by blueknightga6; Nov 29th, 2011 at 9:01 am. Reason: Added a picture.
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post #18 of 20 Old Nov 29th, 2011, 4:03 pm
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Re: Battery Tender

An aside to this thread, if you have a BMW charger that does not have the two pin offset adapter connecter, but just a powerlet male plug....the following cable can be useful to have around sometimes.......

http://www.powerlet.com/product/alli...let-socket/187

JD

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post #19 of 20 Old Nov 29th, 2011, 5:42 pm
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Re: Battery Tender

To clean the outlet, use a bottle brush or test tube brush and a paste of baking soda and water. You may need to trim the bristles down for it to fit properly. Then flush thoroughly with warm water and after blowing it dry with compressed air follow up with a good dose of silicone or WD40 to displace any leftover water.


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post #20 of 20 Old Nov 30th, 2011, 8:10 am
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Re: Battery Tender

Thank to all who contributed to this thread. For a very long time my BMW tender has also been blinking red when I plugged it in. I always thought it mean't it was charging. I checked the plug last night and sure enough it had a wire pulled loose. Reconnected and now I have a comforting green light. Guess I should read the directions and put them somewhere I could find them.

Bruce

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