07 Road King battery draining

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Oct 31, 2013 | 07:45 AM

Tnywill

Thread Starter

2nd Gear

Joined: Oct 2013

Posts: 6

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From: Ohio

07 Road King battery draining

I have an 07 Road King and something seems to be draining the battery. I had the battery checked and it's good. I hard charged it overnight and the battery will last about 2 days and then it doesn't have enough juice to start it again. Any ideas?

Oct 31, 2013 | 07:48 AM

rleggs

Tourer

Joined: Sep 2004

Posts: 451

Likes: 3

From: Laurel,Ms USA

Sounds like you need to check your charging circuit. If you have a service manual and a meter it's not a hard job.

Oct 31, 2013 | 09:29 AM

lionsm13

Seasoned HDF Member

Joined: Oct 2007

Posts: 56,052

Likes: 88,833

From: Western South Dakota

Is it the original battery, you didn't say?
If so, I'd change it out.

If not then could be several things, stator, voltage regulator, etc.

Oct 31, 2013 | 10:40 AM

shooter5074

Outstanding HDF Member

Joined: Jan 2011

Posts: 2,590

Likes: 31

From: Western Illinois, land of bad roads, and corrupt politicians

Quote:

Originally Posted by lionsm13

Is it the original battery, you didn't say?
If so, I'd change it out.

If not then could be several things, stator, voltage regulator, etc.

+1.... you beat me to it.

Oct 31, 2013 | 12:04 PM

knlcox

Novice

Joined: Apr 2013

Posts: 23

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From: Sumter, SC

I recently battled a similar issue... I would have to jump start it if it sat for more than 6-8 hours. I ended up pulling the battery out and then cleaned, scrubbed, & scraped all of the leads, washers, & terminals. Nothing appeared to be corroded at a glance but after I got nice new metal on metal contact I haven't had a bit of trouble. I haven't even put it on the tender while having it sit for a few days.

Oct 31, 2013 | 01:28 PM

mkguitar

Extreme HDF Member

Joined: Sep 2010

Posts: 14,744

Likes: 402

From: Phoenix '53, '88, '09 Big Twins

batteries "drain" if there is a wiring fault, a bad diode in the voltage regulator or even dirt on the battery...current can flow through the dirt from pole to pole.

or the battery could just be done and unable to hold a charge
once fully discharged- as it seems this battery has been- the capacity to hold a charge is reduced by about 40%.

each of these possibilities can be checked with a meter and some smarts.

be warned that a bad battery- if yours is- can destroy the charging system.
a $100 fix becomes a $500 fix

check this thread for fun and hilarity:

https://www.hdforums.com/forum/touri...cable-pic.html

mike