I much prefer to keep the charging system as simple and low tech as
possible. Definitely get rid of the stock shore power converter. It will
cook even the finest battery in short order. My personal preference is a
Progressive Dynamics 60 amp. Others have had good luck with the 45 amp
version, but, the 60 comes with the charge wizard standard. That is a great
addition, no matter which model you choose. A number of GMCers have had
good luck with the IOTA brand. I personally have replaced a couple of them,
don't know the cause of their failures. Might be faulty shore power. I also
use an automatic transfer switch for the Onan 6000 watt generator. Mine
has a built in delay circuit that allows the Onan to stabilize speed and
frequency before it switches on. As for the isolator, several brands give
good service, just be sure to overmatch it to the engine alternator. If you
have a high amp output alternator, make sure the isolator is rated higher
than the alternator. Hook it up exactly like the wiring diagram shows, and
do the next owner of your coach a big favor. I have replaced a number of
combiners of different brands, and have found them to be unreliable enough
as to be untrustworthy, particularly the cheap ones. One hint here, if you
insist on using combiners, DO NOT SHORTEN ANY OF THE LEADS. LEAVE THEM
ALONE, AS THEY CAME OUT OF THE BOX. LONG DANGLING WIRES AND ALL. What that
tells me, is there is some hyper sensitive stuff inside them. That usually
means that they don't like voltage spikes, something you are likely to
encounter quite often in a GMC. Just my experience with a long career
around this stuff. Your experience will vary.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Aug 8, 2017 2:11 PM, "amansfield1104" <
> Thanks everybody Mine was 3 terminal and was shorted between alternator
> and the engine battery. I have removed it and replaced it with a
> Hellroading Tech Combiner (BIC-95150B). I checked it out and it works as
> stated. The disadvantaged is if you want to charger the engine battery from
> the generator you either need a jumper or a switch to switch the
> connection. Right now I have a jumper but I plane to install a switch with
> light to let me know I am charging off the generator or the maintainer.
>
> Thanks again as I had to understand what I had. I started checking out
> the isolator because I keep losing alternators, In two years I have gone
> thru 3 alternators.
>
> The two terminals without wires are for the switch and light. They
> recommended fuses infant of the combiner and they are 60 amp breakers.
>
>
> >
> > Ken,
> >
> > I have a 4 terminal isolator because I'm using a CS130D alternator in my
> serpentine conversion.
> > The 4th terminal gets switched power which goes through a diode to the
> alternator terminal.
> > I can guarantee that the CS alternators will not charge without it being
> powered up.
> >
> > Gary Kosier
> > 77PB w/500Cad
> > Newark, Ohio
> >
> > --------------------------------------------------
> > From: "Ken Burton"
> > Sent: Monday, August 07, 2017 8:33 PM
> > To:
> > Subject: Re: [GMCnet] Problem with isolator?
> >
> >> If he has a 4 terminal isolator, the 4th terminal is usually for
> voltage sensing back to the alternator. It can also be for a 2nd house
> battery. I
> >> wonder if he has it wired correctly.
> >>
> >> Is this indeed a 4 or 5 terminal isolator?
> >> --
> >> Ken Burton - N9KB
> >> 76 Palm Beach
> >> Hebron, Indiana
> >>
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