| Re: [GMCnet] Isolator -- bypass? [message #326857 is a reply to message #326850] |
Thu, 07 December 2017 15:04   |
Dave Stragand
Messages: 307
Registered: October 2017
Karma:
|
Senior Member |
|
|
Thank, Ken! Very helpful. I am indeed attempting to move it back to a
standard configuration, so this is all very helpful.
It's hard to see from the pictures, but the alternator wire does go
directly to the center post of the isolator. Both the top and bottom
wires on the isolator are presently connected to the 'vehicle battery
positive' post, but I realize that the lower wire -should- be going to
the left side of the boost solenoid. That will be corrected with the
new isolator install.
The larger wire on the house side of the boost solenoid goes to an old
battery I had lying around, and the smaller to the non-standard circuit
breaker, which then goes to somewhere unknown inside.
There are more pictures that can help listed below.
http://www.gmcmhphotos.com/photos/member-galleries/p64090-img-2862.html
http://www.gmcmhphotos.com/photos/member-galleries/p64091-img-2863.html
http://www.gmcmhphotos.com/photos/member-galleries/p64092-img-28641.html
http://www.gmcmhphotos.com/photos/member-galleries/p64093-img-2865.html
http://www.gmcmhphotos.com/photos/member-galleries/p64094-img-28661.html
Here's the battery layout, which at present is very confusing:
I'm calling the rear battery the house, and the front battery the
chassis. Rear battery negative goes to a ground on the frame rail.
Rear battery positive connected to left side of boost solenoid. Front
battery top post negative goes to a ground on the engine. Front battery
side post positive goes to the right side of the boost solenoid. Front
battery top post positive goes to the inverter, and has a couple of
fused wires attached that seem to be for the stereo/amp, and possibly
other internal systems that are unknown at this point. Why they
connected them directly to the battery terminal is unknown, especially
considering there are so many more convenient points to do so in the
immediate area.
-Dave
1978 Transmode (403)
Pittsburgh, PA
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Ken
Burton
Sent: Thursday, December 07, 2017 2:37 PM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Isolator -- bypass?
Wow
The picture is a great help. I can not follow every wire in the picture
but some are definitely missing or moved.
1. There appears to be a wire missing from the boost relay left side to
the lower terminal of the isolator. This supplies the house side of
things.
2. The wire from the vehicle positive to the isolator goes on the top
terminal of the isolator. Yours has been moved to the bottom.
3. It appears that the wire from the alternator that is suppose to go
to the center terminal of the isolator has been moved to the bottom
terminal.
This effectively bypasses the isolator for power from the alternator to
the hose side, EXCEPT since the wire from the engine side has been moved
to
the bottom, so it is bypassing the isolator for power to the engine
side.
4. The heavy wire tat goes from the boost solenoid to the rear for the
Onan battery and house power circuits ids still installed and could /
should be reused to supply alternator power to the house systems.
5. I see a CB mounted near the boost relay. It has probably a 10 ga.
wire going somewhere. It is non-standard and I can not guess where it
goes.
I am thinking that I would try to get the system back to OEM so we can
more easily try to help you. When it is non-standard it becomes very
difficult to remotely assist.
Again from what I can see, this Transmode appears to have come out of
the factory wired the same as any GM upfitted GMC. So just about any
GMC Chassis wiring diagram ought to work for you or I can send you an
electronic copy of the one that I have
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
_______________________________________________
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
1978 Transmode (403)
Pittsburgh, PA
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
