How much current does my 2019 FLHTP really use?
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Seasoned HDF Member
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From: NC
How much current does my 2019 FLHTP really use?
How much current does my 2019 FLHTP actually use? It is stated "Charging System. Three-phase, 48-amp high output alternator producing 28 amps at idle, solid state regulator".
I tow trailers, and am considering running a fused wire from my battery to the trailer for that purpose. My volt meter shows above 14 VDC with trailer attached and electric vest running at 50% of less. (I rarely run my vest on high for more than 5 minutes.) My trailers all run LED lights and wiring is good (low resistance). The trailer lights are on a powered trailer converted, so not drawing from the motorcycle harness.
I was also wondering if I should just charge a second battery to handle the USB recharge duties. Do the audio guys charge their audio batteries from the motorcycle charging system?
I tow trailers, and am considering running a fused wire from my battery to the trailer for that purpose. My volt meter shows above 14 VDC with trailer attached and electric vest running at 50% of less. (I rarely run my vest on high for more than 5 minutes.) My trailers all run LED lights and wiring is good (low resistance). The trailer lights are on a powered trailer converted, so not drawing from the motorcycle harness.
I was also wondering if I should just charge a second battery to handle the USB recharge duties. Do the audio guys charge their audio batteries from the motorcycle charging system?
Seasoned HDF Member
Joined: Oct 2019
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From: OH
I`m positive that if you add the draw of each bulb & the vest and the USB it will be far less than 48A
Consider all the crap powered on a cop bike in full service trim
Most have a second battery ( radio) in the "trunk" and both it and the primary battery stay charged.
There`s a fleet of them where I work and they don`t go flat in service
And most are city miles operating at low speed / rpm
JMO
Consider all the crap powered on a cop bike in full service trim
Most have a second battery ( radio) in the "trunk" and both it and the primary battery stay charged.
There`s a fleet of them where I work and they don`t go flat in service
And most are city miles operating at low speed / rpm
JMO
Last edited by eighteight; Dec 29, 2023 at 01:50 PM.
Thread Starter
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Seasoned HDF Member
Joined: Feb 2016
Posts: 7,997
Likes: 6,896
From: NC
I`m positive that if you add the draw of each bulb & the vest and the USB it will be far less than 48A
Consider all the crap powered on a cop bike in full service trim
Most have a second battery ( radio) in the "trunk" and both it and the primary battery stay charged.
There`s a fleet of them where I work and they don`t go flat in service
And most are city miles operating at low speed / rpm
JMO
Consider all the crap powered on a cop bike in full service trim
Most have a second battery ( radio) in the "trunk" and both it and the primary battery stay charged.
There`s a fleet of them where I work and they don`t go flat in service
And most are city miles operating at low speed / rpm
JMO
Stellar HDF Member
Joined: Mar 2008
Posts: 2,328
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28 amps even is a lot. If you're worried about draw, putting an LED bulb in your headlight alone removes something like 5 amps of load, which is huge, and the new LED light is going to be brighter and pull a fraction of that.
If you never drop below 13 volts, your charging system is generating enough current to sustain the loads and keep the battery charged, so I wouldn't worry about it.
If you never drop below 13 volts, your charging system is generating enough current to sustain the loads and keep the battery charged, so I wouldn't worry about it.
Stellar HDF Member
Joined: Mar 2008
Posts: 2,328
Likes: 2,205
That adds over 50% capacity, not trivial.
That said, my Dyna has a 20 amp hour battery and the touring bikes have a 30 amp hour, so they already have 50% more capacity. Sure, my touring bike has a radio and heated grips and such, but the engine the battery ultimately has to start is the same.
That said, my Dyna has a 20 amp hour battery and the touring bikes have a 30 amp hour, so they already have 50% more capacity. Sure, my touring bike has a radio and heated grips and such, but the engine the battery ultimately has to start is the same.
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