Factory Alternator Capabilities?
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Senior User
Joined: Jan 2009
Posts: 449
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From: Central Florida
Factory Alternator Capabilities?
I am adding two 7.5" 130 watt driving lights, and two 6" 100 watt Hella FF lights to the truck. I have the stock ford fog lights, and Silverstars in the headlights.
Does the stock alternator have enough punch to handle these?
I am not really concerned, just want to be sure. For those in the know, what is the max draw of the stock alternator before I see signs of overloading the system??
Thanks in advance.
Does the stock alternator have enough punch to handle these?
I am not really concerned, just want to be sure. For those in the know, what is the max draw of the stock alternator before I see signs of overloading the system??
Thanks in advance.
Lead Driver
Joined: Sep 2007
Posts: 8,180
Likes: 669
From: Scio, OR
You're adding between 35-40 amps of load to the system. The stock alternator is max 110 amp, I believe. But the engine itself draws a pretty significant load itself, plus the headlights, plus the fog lights.
I'm no expert, but if it were me I think I'd want a higher output alternator.
I'm no expert, but if it were me I think I'd want a higher output alternator.
Post Fiend
Joined: Nov 2006
Posts: 6,648
Likes: 1
From: CT
I don't think your stock unit will hold up.
I put in a 200amp unit in that puts out 110amps at idle. It is a VERY nice and well made.
Here is a link all about alternators
Need a high amp alternator vender - TheDieselGarage.com
I put in a 200amp unit in that puts out 110amps at idle. It is a VERY nice and well made.
Here is a link all about alternators
Need a high amp alternator vender - TheDieselGarage.com
Thread Starter
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Senior User
Joined: Jan 2009
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From: Central Florida
Thanks, chamberlain. I am having a hard time believing these four lights will cause too much of an issue. I suppose if the bulbs at greater than 100 watts cause an issue I can always reduce their output and lower the draw??
Lead Driver
Joined: Sep 2007
Posts: 8,180
Likes: 669
From: Scio, OR
Yup. Add up the wattage of each bulb and then divide by 12. That'll be the additional amperage load you'll be putting on the electrical system.
Posting Guru
Joined: Dec 2006
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From: Kansas City/Breckenridge
Being that you have an Excursion you have a higher output alternator stock I'm pretty sure. You have a higher output alternator though, because there is a lot more stuff on your truck that draws power.
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From: Central Florida
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