Home » Public Forums » GMCnet » [GMCnet] Combiner & Isolator
|
|
 Re: [GMCnet] Combiner & Isolator [message #80824 is a reply to message #80822] |
Sat, 17 April 2010 07:59   |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
|
Senior Member |
|
|
Bill,
Probably because it's there and if nothing else, where could you find
a better connection board?
On Sat, Apr 17, 2010 at 5:45 AM, bill schurman <tubby123@aemail4u.com> wrote:
> I installed a combiner several years ago and I am very happy with it. Then some time back I saw that some folks use both the combiner and the OEM isolater. I kept the photos as to how to make the connections. however, I'm not sure what the purpose is in doing that. I saved the isolater and I could reinstall it back with the combiner, however I �just do not know why I would want to that ? It will be a slow weekend and Spring is FINALLY here (well, sort of). So, now is the time for a little project.
>
> Bill Schurman
> 1978 Palm Beach TZE168V100258
> Steamboat Springs, CO
> at the base of "Rabbit Ears Pass"
> With a 7% grade
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: [GMCnet] Combiner & Isolator [message #80838 is a reply to message #80824] |
Sat, 17 April 2010 10:26 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
|
Senior Member |
|
|
Steve is just right, if you are running with a combiner, you are good to
go.
some GMCers use functions that need the diode isolation, so it is easy (10
min) to attach the combiner to the isolator and get the best of both worlds.
good-to-go
gene
On Sat, Apr 17, 2010 at 5:59 AM, Steven Ferguson <botiemad11@gmail.com>wrote:
> Bill,
> Probably because it's there and if nothing else, where could you find
> a better connection board?
>
> On Sat, Apr 17, 2010 at 5:45 AM, bill schurman <tubby123@aemail4u.com>
> wrote:
> > I installed a combiner several years ago and I am very happy with it.
> Then some time back I saw that some folks use both the combiner and the OEM
> isolater. I kept the photos as to how to make the connections. however, I'm
> not sure what the purpose is in doing that. I saved the isolater and I could
> reinstall it back with the combiner, however I just do not know why I would
> want to that ? It will be a slow weekend and Spring is FINALLY here (well,
> sort of). So, now is the time for a little project.
> >
> > Bill Schurman
> > 1978 Palm Beach TZE168V100258
> > Steamboat Springs, CO
> > at the base of "Rabbit Ears Pass"
> > With a 7% grade
> > _______________________________________________
> > GMCnet mailing list
> > List Information and Subscription Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> >
>
>
>
> --
> Steve Ferguson
> '76 EII
> Sierra Vista, AZ
> Urethane bushing source
> www.bdub.net/ferguson/
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Gene Fisher -- 74-23,77PB/ore/ca
�Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
|
|
|
|
|
|
| Re: [GMCnet] Combiner & Isolator [message #80855 is a reply to message #80838] |
Sat, 17 April 2010 14:39 |
jayrabe
Messages: 509
Registered: June 2009
Location: Portland, OR
Karma: 0
|
Senior Member |
|
|
Well, 10 minutes is optimistic. It took me an hour and a half. But then, like all projects, most of the time is spent finding tools, repairing tools, finding hardware, running to the Ace for just the right screws, drilling the mounting, another trip to the Ace for hardware I'd forgotten, etc. Still, all in all a very straightforward and easy install.
:-)
J
76 PB
Portland, OR
> Date: Sat, 17 Apr 2010 08:26:10 -0700
> From: mr.erfisher@gmail.com
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] Combiner & Isolator
>
> Steve is just right, if you are running with a combiner, you are good to
> go.
>
> some GMCers use functions that need the diode isolation, so it is easy (10
> min) to attach the combiner to the isolator and get the best of both worlds.
>
>
> good-to-go
>
> gene
>
>
> On Sat, Apr 17, 2010 at 5:59 AM, Steven Ferguson <botiemad11@gmail.com>wrote:
>
> > Bill,
> > Probably because it's there and if nothing else, where could you find
> > a better connection board?
> >
> > On Sat, Apr 17, 2010 at 5:45 AM, bill schurman <tubby123@aemail4u.com>
> > wrote:
> > > I installed a combiner several years ago and I am very happy with it.
> > Then some time back I saw that some folks use both the combiner and the OEM
> > isolater. I kept the photos as to how to make the connections. however, I'm
> > not sure what the purpose is in doing that. I saved the isolater and I could
> > reinstall it back with the combiner, however I just do not know why I would
> > want to that ? It will be a slow weekend and Spring is FINALLY here (well,
> > sort of). So, now is the time for a little project.
> > >
> > > Bill Schurman
> > > 1978 Palm Beach TZE168V100258
> > > Steamboat Springs, CO
> > > at the base of "Rabbit Ears Pass"
> > > With a 7% grade
> > > _______________________________________________
> > > GMCnet mailing list
> > > List Information and Subscription Options:
> > > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> > >
> >
> >
> >
> > --
> > Steve Ferguson
> > '76 EII
> > Sierra Vista, AZ
> > Urethane bushing source
> > www.bdub.net/ferguson/
> > _______________________________________________
> > GMCnet mailing list
> > List Information and Subscription Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> >
>
>
>
> --
> Gene Fisher -- 74-23,77PB/ore/ca
> �Give a man a fish; you have fed him for today --- give him a URL and
> -------
> http://gmcmotorhome.info/
> Alternator Protection Cable
> http://gmcmotorhome.info/APC.html
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_________________________________________________________________
Hotmail has tools for the New Busy. Search, chat and e-mail from your inbox.
http://www.windowslive.com/campaign/thenewbusy?ocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_1
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
|
|
|
|
|
|
| Re: [GMCnet] Combiner & Isolator [message #80864 is a reply to message #80822] |
Sat, 17 April 2010 17:55 |
bill schurman
Messages: 97
Registered: February 2004
Karma: 0
|
Member |
|
|
However, do I not need the isolator to power the hi switch? Or can it be powered in a different way from the alternator? (I have had the combiner [only] installed for several years without any problem, however the hi switch does not work on my ' 78 coach)
Bill Schurman
1978 Palm Beach TZE168V100258
Steamboat Springs, CO
at the base of "Rabbit Ears Pass"
With a 7% grade
--- rwdenney@gmail.com wrote:
From: Richard Denney <rwdenney@gmail.com>
To: "gmclist@temp.gmcnet.org" <gmclist@temp.gmcnet.org>
Subject: Re: [GMCnet] Combiner & Isolator
Date: Sat, 17 Apr 2010 18:46:55 -0400
On Saturday, April 17, 2010, bill schurman <tubby123@aemail4u.com> wrote:
> ... I saved the isolater and I could reinstall it back with the combiner, however I just do not know why I would want to that ?
Bill, using a combiner with the isolator has only one advantage: it
prevents electricity from reaching back along the alternator wire, so
that the wire only has power when the engine is actually turning. That
lets you use that wire to power a fuel pump, for instance. I don't do
that and haven't missed the isolator. It also makes it much easier to
install a combiner the first time, and much easier to explain to
people how to do it.
Rick "working fine without an isolator" Denney
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Re: [GMCnet] Combiner & Isolator [message #80880 is a reply to message #80864] |
Sat, 17 April 2010 21:22 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
|
Senior Member |
|
|
| bill schurman wrote on Sat, 17 April 2010 17:55 |
However, do I not need the isolator to power the hi switch? Or can it be powered in a different way from the alternator? (I have had the combiner [only] installed for several years without any problem, however the hi switch does not work on my ' 78 coach)
Bill Schurman
1978 Palm Beach TZE168V100258
Steamboat Springs, CO
at the base of "Rabbit Ears Pass"
With a 7% grade
|
When you installed the combiner where did you attach the wire that was on the isolator and went to the blower relay?
If it is attached to the combiner then you have a bad wire, a bad fuse, a bad blower relay, or a bad fan control switch.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
|
|
|
|
|
|
| Re: [GMCnet] Combiner & Isolator [message #80911 is a reply to message #80906] |
Sun, 18 April 2010 13:55 |
GMCWiperMan
Messages: 1248
Registered: December 2007
Karma: 1
|
Senior Member |
|
|
Les,
Your concern is justified; the battery DOES serve as a great big sinkhole
for noise of all sorts. Any delicate electronic equipment will probably do
best if connected directly to the battery. That's one reason most things
should NOT be connected to the alternator side of the isolator. But neither
the OEM HVAC fan nor the add-on fuel pump is delicate enough to be disturbed
by the noisy, unfiltered alternator output.
Ken H.
On Sun, Apr 18, 2010 at 2:21 PM, Les Burt <burtco99@yahoo.com> wrote:
> Ok, Now I understand the advantages of using an Isolator and a combiner
> together. I do have a concern that relates to the longterm effects of
> running electrical equipment direct from the alternator output BEFORE the
> isolator diodes.
>
> I'm curious to hear what the more knowledgeable techs have to say, so this
> is directed towards you electrical gurus.
>
> Here are a few of my thoughts so that you understand where I'm coming from.
>
> - Older alternators such as those used on the GMC do not provide a clean DC
> signal. The vehicles of the same era relied on the battery to help absorb
> the fluxuations and "clean" the dirty alternator output.
>
> - Placing a diode isolator between the battery and the Alternator output
> has
> the effect of reducing the battery's ability to stabilize the alternator
> output. The result is higher voltage fluxuations, and dirtier DC at the alt
> output than at the battery. This is due to the resistance within the
> isolator.
>
> - I was frequently burning 100w halogen bulbs on my car(every 2-3 months)
> with the wiring harness connected to the alternator output. I switched the
> wire to the battery post and the bulbs survived near twice as long. I
> compaired voltage under several conditions and never saw more than 0.2V
> difference between the alt and the battery, so I have to assume that the
> dirty alt output affected my lights.
>
> So my concern is this:
>
> Will the alternator output BEFORE the isolator diodes have any potential
> negative effect on any devices powered from that output?
>
> Has anyone put the alternator output on an occilloscope to see how clean it
> actually is?
> How about a comparison of the 12V output at the isolator as well as at the
> battery?
>
> I doubt that the heavier windings of a fan motor or a fuel pump would
> suffer, but other more complex devices might not be so tolerant.
>
> Thanks,
> Les Burt
> Montreal
> 1975 Eleganza II 26ft
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
|
|
Goto Forum:
Current Time: Mon Mar 10 07:11:25 CDT 2025
Total time taken to generate the page: 0.01530 seconds
|
GMCforum
Search
Help
Register
Login
Home
