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I added charging terminals accessible by removing the cover on the bumper where a tow hitch mounts. These connect directly to the battery terminals with heavy gauge cables. I attach the battery tender to these and put a piece of tape on the steering wheel that says " disconnect the charger" so the wife doesn't back out of the garage with the charger attached.
Battery still shows 12.8V after sitting 4 days without the battery tender attached. The alternator might not put out enough voltage/amperage to charge the AGM battery up all the way.
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2003 X5 Steel Grey
3.0i e53
Last edited by Blowout; Today at 02:55 AM.
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