Chassis wiring questions

I say you still need to replace the defective isolator. One of its functions is to send back a sample of the charging voltage to the engine battery to control the voltage regulator and keep the alternator from going nuts with too high voltage output which can do nasty things to the vehicle electrical systems.

What the combiner does is to allow either the vehicle alternator OR the 120 Volt battery charger (converter) to charge BOTH battery systems.

Having both combiner and isolator in working order are generally (not always) recommended by GMC motorhome cognicenti!

D C "Mac" Macdonald​
Amateur Radio K2GKK​
Since 30 November '53​
USAF and FAA, Retired​
Member GMCMI & Classics​
Oklahoma City, OK​
"The Money Pit"​
TZE166V101966
________________________________
From: Gmclist on behalf of stephen.brenton--- via Gmclist
Sent: Monday, July 1, 2019 13:44
To: gmclist
Cc: stephen.brenton
Subject: Re: [GMCnet] Chassis wiring questions

> Once system is opperating correctly invest in the Yandina combiner to mount next to your isolator area. One ground and 2 battery leads to the
> isolator B1 and B2 terminals will bring an update into the 21st century.

I happened to find and read this thread and since I have a new (to me) GMC and I have a bad diode in the "Isolator" it's time for me to do something.
Does the Yandina Combiner completely replace the diode set which was original in the GMC? Is Yandina comparable to Blue Sea?

Thanks in advance
Stephen

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Noted someplace, Alan Henderson runs a computer printing business, and does some phenomenal stuff with BIG format printers. If you weren't at the
recent rally, they're available by mail/ups. If I had a GMC in the shop as a regular thing, I'd have them on the wall on hardboard of some type. We
always put a blowup of the transmitter schematic on the wall. Mods in red, dated etc. For temp mods hang a piece of Saran Wrap over it and use
it to write changes on

--johnny
--
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
 
I don’t think the isolator performs the function of controlling the voltage regulator. It is there to do as it’s name implies, isolate one set of batteries from the other and to allow the alternator to charge both batteries. There is a sensor wire from the alternator that controls the voltage regulator but that wire does not connect to the isolator.
There are quite a few people that have eliminated the isolator and just use a combiner.
The combiner basically connects the two batteries in parallel.
Then there are other people, like me, that don’t see the need for a combiner. With a properly operating isolator both batteries are charged by the engine without connecting batteries in parallel. Two batteries in parallel will only charge each to the limit allowed by the weaker battery set.
When hooked up to a land line or when using my Onan I have a smart charger with independent circuits for charging the house and the engine batteries that does not connect the two together.

Emery Stora
77 Kingsley
Frederick CO

>
> I say you still need to replace the defective isolator. One of its functions is to send back a sample of the charging voltage to the engine battery to control the voltage regulator and keep the alternator from going nuts with too high voltage output which can do nasty things to the vehicle electrical systems.
>
> What the combiner does is to allow either the vehicle alternator OR the 120 Volt battery charger (converter) to charge BOTH battery systems.
>
> Having both combiner and isolator in working order are generally (not always) recommended by GMC motorhome cognicenti!
>
> D C "Mac" Macdonald​
> Amateur Radio K2GKK​
> Since 30 November '53​
> USAF and FAA, Retired​
> Member GMCMI & Classics​
> Oklahoma City, OK​
> "The Money Pit"​
> TZE166V101966
> ________________________________
> From: Gmclist on behalf of stephen.brenton--- via Gmclist
> Sent: Monday, July 1, 2019 13:44
> To: gmclist
> Cc: stephen.brenton
> Subject: Re: [GMCnet] Chassis wiring questions
>

>> Once system is opperating correctly invest in the Yandina combiner to mount next to your isolator area. One ground and 2 battery leads to the
>> isolator B1 and B2 terminals will bring an update into the 21st century.
>
>
> I happened to find and read this thread and since I have a new (to me) GMC and I have a bad diode in the "Isolator" it's time for me to do something.
> Does the Yandina Combiner completely replace the diode set which was original in the GMC? Is Yandina comparable to Blue Sea?
>
> Thanks in advance
> Stephen
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
 
> Once system is opperating correctly invest in the Yandina combiner to mount next to your isolator area. One ground and 2 battery leads to the
> isolator B1 and B2 terminals will bring an update into the 21st century.

I happened to find and read this thread and since I have a new (to me) GMC and I have a bad diode in the "Isolator" it's time for me to do something.
Does the Yandina Combiner completely replace the diode set which was original in the GMC? Is Yandina comparable to Blue Sea?

Thanks in advance
Stephen
==================
 
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