Author Topic: Total AMP draw on 1998 FXDWG  (Read 221 times)

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Offline dubepj

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Total AMP draw on 1998 FXDWG
« on: December 26, 2017, 08:40:13 AM »
My bike is a 1998 Dyna Wide Glide.  I think it has a 32 amp charging system.  I'm going to add hand warmers that draw total of 3.0 amps on high position.
The headlamp is a 55 watt low beam and 60 watts high beam. So 4.5 amp draw on low and 5.0 amp draw on high beam.
Taillight has a 1157 bulb that draws about 4.0 amps if both brake light and tail light are on at the same time.
Signal lights have two 1156 bulb per side that draw  about 2.0 amps each, so 4.0 amps.
So I'm guessing total amp draw on my 32 amp system will be about  16 to 17 amps, so I should be well within what my charging system delivers.
Let me know if I am doing something wrong in doing my calculations.  I believe I estimated a bit high on tail light and signal light bulbs.
Thanks a lot everyone.

Offline JW113

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Re: Total AMP draw on 1998 FXDWG
« Reply #1 on: December 26, 2017, 09:20:43 AM »
Don't forget the coil. Add 4 amps for that.

-JW
2004 FLHRS   1977 FLH Shovelhead  1992 FLSTC
1945 Indian Chief   1978 XL Bobber

Offline PIRSCH FIRE WAGON

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Re: Total AMP draw on 1998 FXDWG
« Reply #2 on: December 27, 2017, 08:42:35 AM »
You can actually go to 80% of its rated capacity (25 amps) at Idle so long as you're riding the Motorcycle and its not just sitting for an hour idling. Normal stop and go. This is because it's "Single Phase System". If your Battery is not in Good Condition, or Wire Connection (especially Ground) that will reduce it further. Heat also is a major contributing factor for maintaining Amperage Output at any given time.

With that being said, The only real way to know is to test the Amperage Output with/without Draw. You'll probably see its right around 20 Loaded and 24- 28 Amps without the Load cold after startup..

I would recommend, to be within it's rated Capacity, expecting it maintain a Charge of the Battery and Power everything. And, assuming all parts are in "Fair - Good Condition,  60% (20 Amps) of its the Original System Rating and feel comfortable with an older system as the MAXIMUM draw.

That's just me.

Tom

Offline JW113

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Re: Total AMP draw on 1998 FXDWG
« Reply #3 on: December 27, 2017, 11:04:44 AM »
I don't think it's putting out a whole lot of power at idle, and I wouldn't worry about that either. So what if you're running on the battery at idle, as long as you spend most of the time above 2Krpm or so to charge it back up. The battery is like a bank account, stores power for you to borrow when needed (like at start up) and to fill back up when the charging system is running. The alternator is a fixed magnet dynamo, the faster it spins, the more power it produces.

Speaking of that, you also need to consider the amps being drawn by the battery after a start up to recharge it, that also takes away from the available output of the alternator. If you're not going to be doing a lot of short ride stop & go, then no big deal.

-JW
2004 FLHRS   1977 FLH Shovelhead  1992 FLSTC
1945 Indian Chief   1978 XL Bobber

Online Hossamania

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Re: Total AMP draw on 1998 FXDWG
« Reply #4 on: December 27, 2017, 11:10:48 AM »
The same reason it doesn't help to start it in the winter to charge it. I have too many people tell me that's what they do. I tell to stop doing that, put a tender on it, and don't start it unless you're going for a twenty minute or more ride.
No shirt, no shoes, but I still get service.
Why? Girl, look at this body!

Offline JW113

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Re: Total AMP draw on 1998 FXDWG
« Reply #5 on: December 27, 2017, 11:13:53 AM »
And one more thing....

I'd suggest one of these little beauties, whether you're adding more electrical loads or not. Of all the things on a HD that's likely to fail first, it's the electrical system. So not a bad idea to keep an eye on it, eh?

https://www.batterymart.com/p-081-0157-digital-voltage-indicator-lcd.html?gclid=EAIaIQobChMIqdvN8ZGy1QIVF4ezCh2pOQdLEAQYAiABEgLbnvD_BwE

[ Guests cannot view attachments ]


-JW
2004 FLHRS   1977 FLH Shovelhead  1992 FLSTC
1945 Indian Chief   1978 XL Bobber

Offline sfmichael

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Re: Total AMP draw on 1998 FXDWG
« Reply #6 on: December 27, 2017, 11:57:45 AM »
And one more thing....

I'd suggest one of these little beauties, whether you're adding more electrical loads or not. Of all the things on a HD that's likely to fail first, it's the electrical system. So not a bad idea to keep an eye on it, eh?

https://www.batterymart.com/p-081-0157-digital-voltage-indicator-lcd.html?gclid=EAIaIQobChMIqdvN8ZGy1QIVF4ezCh2pOQdLEAQYAiABEgLbnvD_BwE

(Attachment Link)


-JW

great idea - thanks  :up:
Colorado Springs, CO.

Offline nibroc

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Re: Total AMP draw on 1998 FXDWG
« Reply #7 on: December 27, 2017, 02:39:42 PM »
I like the $38 postage for a $13 2 1/2 oz. item
« Last Edit: December 27, 2017, 03:19:28 PM by nibroc »

Offline JW113

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Re: Total AMP draw on 1998 FXDWG
« Reply #8 on: December 27, 2017, 04:10:04 PM »
What??
 :down:

Screw those guys then. Surf the net & find a better deal.

-JW
2004 FLHRS   1977 FLH Shovelhead  1992 FLSTC
1945 Indian Chief   1978 XL Bobber

Offline Deye76

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Re: Total AMP draw on 1998 FXDWG
« Reply #9 on: December 27, 2017, 04:47:03 PM »
38 bucks is next day air.  :down:

US Mail First Class (10-14 days) $2.99

U.S.P.S. Priority MailŪ $7.98
From the link JW113 posted, not out of line at all.  :up:

East Tenn.
2014 CVO RK, 2015 RGS, 1992 FXRP

Offline Harley_Cruiser Rocker Lockers

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Re: Total AMP draw on 1998 FXDWG
« Reply #10 on: December 27, 2017, 05:56:28 PM »
And one more thing....

I'd suggest one of these little beauties, whether you're adding more electrical loads or not. Of all the things on a HD that's likely to fail first, it's the electrical system. So not a bad idea to keep an eye on it, eh?

https://www.batterymart.com/p-081-0157-digital-voltage-indicator-lcd.html?gclid=EAIaIQobChMIqdvN8ZGy1QIVF4ezCh2pOQdLEAQYAiABEgLbnvD_BwE

(Attachment Link)


-JW
Humm, trying to figure out where that is on the bike?
Steve
www.Rockerlockers.com  Call for dealer discount

Offline JW113

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Re: Total AMP draw on 1998 FXDWG
« Reply #11 on: December 27, 2017, 07:02:35 PM »
Well, that one in the pic happens to be on a Shovelhead, between the tanks.
 :SM:

-JW
2004 FLHRS   1977 FLH Shovelhead  1992 FLSTC
1945 Indian Chief   1978 XL Bobber

Offline Burnout

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Re: Total AMP draw on 1998 FXDWG
« Reply #12 on: December 28, 2017, 06:31:39 AM »
The same reason it doesn't help to start it in the winter to charge it. I have too many people tell me that's what they do. I tell to stop doing that, put a tender on it, and don't start it unless you're going for a twenty minute or more ride.

The other reason is the cheese that builds up in the heads and oil tank from not getting it up to temperature.

DONT START IT UNLESS YOU ARE GOING TO RIDE IT!!!

Use a battery tender, your battery will "love you, long time".   :agree:
They don't call me Ironhead Rick just because I'm "hard headed"