| Re: [GMCnet] Isolator -- bypass? [message #326841 is a reply to message #326823] |
Thu, 07 December 2017 11:00   |
Dave Stragand
Messages: 307
Registered: October 2017
Karma:
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Senior Member |
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Hi Ken,
Thanks for the offer! I may take you up on that sometime. I'm afraid
there are differences in my coach between the original as-delivered
Transmode wiring and its current state. It is a true Transmode and was
not upfitted into a motorhome initially. My research so far shows that
while it was originally delivered to Phoenix, it may have spent time as
a ski lodge shuttle in Tennessee.
The original sales invoice from GM shows it was originally delivered
with an Onan 6K generator, though it presently has a 4K Onan BFA
instead. There was a starter attery for the generator installed at the
driver's rear, but it is not connected to any internal 12v systems.
http://www.gmcmhphotos.com/photos/1978-transmode-first-pictures/p64088-i
mg-2680.html
All of the current 12v house interior systems (pretty much just some
lighting) are connected via a fused link connected to the chassis
battery.
There is a large inverter now connected to a secondary battery that runs
the microwave and fridge (120VAC). I don't know how the rest of the
house is wired yet, 120V-wise, but we will be stripping out the interior
down to the shell and starting from scratch. The other known 120VAC
systems I have found in the coach are two roof AC units and some
outlets. I have not found any water heater yet, but I'm hoping there is
one.
And yes, I know that the way things are now is mostly incorrect, but
I'll set it right.
A current pic of the inverter area wiring is here:
http://www.gmcmhphotos.com/photos/1978-transmode-first-pictures/p63984-i
mg-23521.html I will be replacing the inverter next week.
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Ken
Burton
Sent: Thursday, December 07, 2017 1:25 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Isolator -- bypass?
Something is not Kosher here.
The alternator putting out 14.7 volts is great with an isolator
installed. The alternator monitors the voltage on the engine side of
the isolator and raises or lowers it's output voltage trying to maintain
around 14.0 volts at the engine battery. You are saing that is is only
12 volts.
So what you are saying is the alternator is doing it's job correctly
while the sensing line to the alternator must be low. I am thinking you
have a wiring error(s) somewhere.
Are you positive that you have no 12 volt supply to anything on the
house side of the coach?
I am looking at a wiring Labeled "78 GMC Transmode" and it shows an
auxiliary battery, Boost relay, Isolator, and Onan Generator.
If you send me your email address I'll forward this diagram to you. It
looks the same or very similar to a normal (non-Transmode) 26 foot GMC.
If you want to talk about this on the phone, look up my unlisted number
on the "Black List" under Indiana. If you get my voice mail when you
call,
speak SLOWLY and repeat any numbers twice. I have a hearing loss and if
I do not understand your message I will not be able to call you back.
Ken Burton
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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1978 Transmode (403)
Pittsburgh, PA
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