Electrical drain
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Stage II
Joined: Sep 2023
Posts: 2
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From: Canada
Electrical drain
Hello all,
I have good battery but if FLHTC sits for two weeks as sometimes happen while I ride the others, it drains the battery and won't crank the engine Is there something that is always on even if the key is off?
jerry
I have good battery but if FLHTC sits for two weeks as sometimes happen while I ride the others, it drains the battery and won't crank the engine Is there something that is always on even if the key is off?
jerry
Seasoned HDF Member
Joined: Feb 2007
Posts: 6,067
Likes: 1,121
From:
Your FLHTC is of an unknown reported year.
It is also unknown if you have a security system.
YES, on newer bikes with computers there is generally a small drain.
A parasitic drain can be checked with a digital voltage meter.
Your battery age and type are also an unknown.
A lithium battery can go to "sleep" if the temp gets cold and requires a short wake-up time by turning something electrical ON for a few minutes before cranking.
For example if it has a battery that is greater than 3 years old then a battery load test might be a good idea.
I semi accurate test can also be done with the same digital voltage meter while bike is cranking to check for drop down voltage.
It is also unknown if you have a security system.
YES, on newer bikes with computers there is generally a small drain.
A parasitic drain can be checked with a digital voltage meter.
Your battery age and type are also an unknown.
A lithium battery can go to "sleep" if the temp gets cold and requires a short wake-up time by turning something electrical ON for a few minutes before cranking.
For example if it has a battery that is greater than 3 years old then a battery load test might be a good idea.
I semi accurate test can also be done with the same digital voltage meter while bike is cranking to check for drop down voltage.
Seasoned HDF Member
Joined: May 2008
Posts: 21,031
Likes: 12,553
From: South Carolina
Actual parasitic drain on an Evo era electrical system is pretty rare.
With a battery of unknown age and losing charge in a short period of time, I would say it is time for it to go...
A discharged battery will freeze, so I would remove the battery from the bike, and in the spring put a new battery in.
With a battery of unknown age and losing charge in a short period of time, I would say it is time for it to go...
A discharged battery will freeze, so I would remove the battery from the bike, and in the spring put a new battery in.
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