Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

> Is the black box in the alternator needed?
tornik550
post Aug 15 2012, 03:37 PM
Post #1


Senior Member
***

Group: Members
Posts: 1,248
Joined: 29-January 07
From: Ohio
Member No.: 7,486
Region Association: None
What does the black box in the alternator do and is it needed? I have heard several times that it dampens interference with the radio. I do not have a radio so do I need the black box?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
 
 Reply to this topicStart new topic
Replies(1 - 15)
timothy_nd28
post Aug 15 2012, 04:22 PM
Post #2


Advanced Member
****

Group: Members
Posts: 2,299
Joined: 25-September 07
From: IN
Member No.: 8,154
Region Association: Upper MidWest
Not needed, its the 2nd part of a LC circuit to change and alter frequency's.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Tom
post Aug 15 2012, 04:58 PM
Post #3


Advanced Member
****

Group: Members
Posts: 2,139
Joined: 21-August 05
From: Port Orchard, WA 98367
Member No.: 4,626
Region Association: None
Yes it is needed. I believe I mentioned this before on another thread. It is used to dampen out the ac component on the DC after it has been rectified from the AC the alternator puts out to the DC the battery needs for charging. Typically an alternator voltage rectified to DC has up to 10% ac component before being filtered. Ie, without the filter, you may have as much as 1.3 volts ac component superimposed on the DC level, also known as ripple. Not good for electronics and definitely bad for stereos.
Tom
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
SLITS
post Aug 15 2012, 05:05 PM
Post #4


"This Utah shit is HARSH!"
**********

Group: Benefactors
Posts: 13,602
Joined: 22-February 04
From: SoCal Mountains ...
Member No.: 1,696
Region Association: None
Damn, and all these years I have run without them.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
timothy_nd28
post Aug 15 2012, 05:23 PM
Post #5


Advanced Member
****

Group: Members
Posts: 2,299
Joined: 25-September 07
From: IN
Member No.: 8,154
Region Association: Upper MidWest
The 10 percent ripple AC current seems abit high, it's possible one of your 6 diodes were faulty.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
SLITS
post Aug 15 2012, 05:45 PM
Post #6


"This Utah shit is HARSH!"
**********

Group: Benefactors
Posts: 13,602
Joined: 22-February 04
From: SoCal Mountains ...
Member No.: 1,696
Region Association: None
Anyway, found it on AA's site ... 021 903 295 Suppressor Condenser ... $11.80 ea
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Cap'n Krusty
post Aug 15 2012, 05:47 PM
Post #7


Cap'n Krusty
**********

Group: Members
Posts: 10,794
Joined: 24-June 04
From: Santa Maria, CA
Member No.: 2,246
Region Association: Central California
QUOTE(SLITS @ Aug 15 2012, 04:05 PM) *

Damn, and all these years I have run without them.


And just look at you. THAT should be a lesson for all of us. Talk about an electrical "short"!

The Cap'n
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
tornik550
post Aug 15 2012, 05:59 PM
Post #8


Senior Member
***

Group: Members
Posts: 1,248
Joined: 29-January 07
From: Ohio
Member No.: 7,486
Region Association: None
QUOTE(SLITS @ Aug 15 2012, 07:45 PM) *

Anyway, found it on AA's site ... 021 903 295 Suppressor Condenser ... $11.80 ea




I tried. They are nla.

Can a faulty black box cause a fire on the starter to alt wire?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
timothy_nd28
post Aug 15 2012, 06:04 PM
Post #9


Advanced Member
****

Group: Members
Posts: 2,299
Joined: 25-September 07
From: IN
Member No.: 8,154
Region Association: Upper MidWest
Yes, capacitors are the weakest link of any electrical component. The dieletric often degrades over time, and these can short out to gnd.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
SLITS
post Aug 15 2012, 06:07 PM
Post #10


"This Utah shit is HARSH!"
**********

Group: Benefactors
Posts: 13,602
Joined: 22-February 04
From: SoCal Mountains ...
Member No.: 1,696
Region Association: None
QUOTE(Cap'n Krusty @ Aug 15 2012, 04:47 PM) *

QUOTE(SLITS @ Aug 15 2012, 04:05 PM) *

Damn, and all these years I have run without them.


And just look at you. THAT should be a lesson for all of us. Talk about an electrical "short"!

The Cap'n


Nice shot admidships my friend (IMG:style_emoticons/default/evilgrin.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
KELTY360
post Aug 15 2012, 06:27 PM
Post #11


914 Neferati
*****

Group: Members
Posts: 5,031
Joined: 31-December 05
From: Pt. Townsend, WA
Member No.: 5,344
Region Association: Pacific Northwest
QUOTE(Cap'n Krusty @ Aug 15 2012, 04:47 PM) *

QUOTE(SLITS @ Aug 15 2012, 04:05 PM) *

Damn, and all these years I have run without them.


And just look at you. THAT should be a lesson for all of us. Talk about an electrical "short"!

The Cap'n


(IMG:style_emoticons/default/av-943.gif) (IMG:style_emoticons/default/av-943.gif) (IMG:style_emoticons/default/av-943.gif) (IMG:style_emoticons/default/av-943.gif) (IMG:style_emoticons/default/lol-2.gif) (IMG:style_emoticons/default/lol-2.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
tornik550
post Aug 15 2012, 07:19 PM
Post #12


Senior Member
***

Group: Members
Posts: 1,248
Joined: 29-January 07
From: Ohio
Member No.: 7,486
Region Association: None
Is there a way to test the "black box"
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Mike Bellis
post Aug 15 2012, 09:09 PM
Post #13


Resident Electrician
*****

Group: Members
Posts: 8,345
Joined: 22-June 09
From: Midlothian TX
Member No.: 10,496
Region Association: None
QUOTE(tornik550 @ Aug 15 2012, 06:19 PM) *

Is there a way to test the "black box"

With an LC meter if you know the correct Farads it should be.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
brant
post Aug 15 2012, 09:51 PM
Post #14


914 Wizard
**********

Group: Members
Posts: 11,625
Joined: 30-December 02
From: Colorado
Member No.: 47
Region Association: Rocky Mountains
I've been missing John around there.
I hope you were on vacation or something good

Nice come back!

b
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Cap'n Krusty
post Aug 15 2012, 10:22 PM
Post #15


Cap'n Krusty
**********

Group: Members
Posts: 10,794
Joined: 24-June 04
From: Santa Maria, CA
Member No.: 2,246
Region Association: Central California
QUOTE(brant @ Aug 15 2012, 08:51 PM) *

I've been missing John around there.
I hope you were on vacation or something good

Nice come back!

b


Thanks! I'm dealing with moving my parents to a site much closer, and am hoping to the the 400 mile round trip each week, as well as the frequent 4 day weekends and no internet services. This has been going on, with increasing frequency, for nearly 2 years, and Lyn, I, and my 2 sisters are physically and emotionally as beat up as we can stand. Couple more weeks, and I'll be back to the old equal opportunity harrasser you know and love.

The Cap'n
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
brant
post Aug 15 2012, 10:25 PM
Post #16


914 Wizard
**********

Group: Members
Posts: 11,625
Joined: 30-December 02
From: Colorado
Member No.: 47
Region Association: Rocky Mountains
QUOTE(Cap'n Krusty @ Aug 15 2012, 10:22 PM) *

QUOTE(brant @ Aug 15 2012, 08:51 PM) *

I've been missing John around there.
I hope you were on vacation or something good

Nice come back!

b


Thanks! I'm dealing with moving my parents to a site much closer, and am hoping to the the 400 mile round trip each week, as well as the frequent 4 day weekends and no internet services. This has been going on, with increasing frequency, for nearly 2 years, and Lyn, I, and my 2 sisters are physically and emotionally as beat up as we can stand. Couple more weeks, and I'll be back to the old equal opportunity harrasser you know and love.

The Cap'n



wow...that is tough
I can't imagine
if there is anything I can do

hang in there

brant
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Switch to: Standard · Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 19th May 2024 - 09:55 AM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...