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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 09-24-2012, 05:58 PM
tolpi1 tolpi1 is offline
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Location: Idaho
Join Date: Sep 2012
Posts: 2
Mein Auto: 1999 BMW 528i
Cool Alternator on a 1999 528i

Hey, so I have a 1999 528i. I'm looking to add some new lights. From what I can tell it has a Bosch AL0703X alternator in it. (120 amps) Everything that takes electricity is all stock, nothing after market. Does that alternator have enough power to run some more stuff? If so how much more?
I am sorry if I sound dumb, I don't know very much about electronics.

Thanks Guys,
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Old 09-24-2012, 06:40 PM
air_cooled air_cooled is offline
Officially Welcomed to the 'Fest
Location: Canada
Join Date: Apr 2009
Posts: 434
Mein Auto: E39 / E30 / E53
Not a dumb question
So if you are, for example, putting some extra 65watt bulbs (*2) that will give you about an 11 amp draw. I don't know the designed load of the car but would think BMW would have build some margin for when all lights were on, fans running, stereo booming, defogger - 'foggin', seats a heating, seats a reclining and still have power for the transmission
I'm sure you'll be ok with some extra lighting.
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Old 09-25-2012, 12:30 PM
bluebee's Avatar
bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 25,236
Mein Auto: 02 BMW 525i M54 auto 130K
Originally Posted by air_cooled View Post
that will give you about an 11 amp draw
I wonder if we could put an ammeter clamped over the red positive wire coming out of the alternator to see what it outputs under 'normal' loads?
Please read the suggested threads and add value, either by pictures or by descriptions, so the next person stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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