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Wiring diagrams

Looking for 1993 U240 coach wiring diagram.  Thanks 😊

Re: Wiring diagrams

Reply #1 –
Terry,

Welcome.

12 VDC or 120 VAC?

And, any particular area/device you are interested in?

Re: Wiring diagrams

Reply #2 –
12v
Coach
Source of power to dash incl start lock switch

Re: Wiring diagrams

Reply #3 –
Terry,

A good place to start your troubleshooting is the IGNITION SOLENOID.

Open the dash (hinged in front by windshield).

Ignition solenoid is in front of driver's area.

Two large lugs-- one should always have chassis battery voltage.  The other large lug should only have voltage (same voltage as the other large lug) when the ignition is on.

Let us know what you find.

Re: Wiring diagrams

Reply #4 –
Quote from: TerryW –
Looking for 1993 U240 coach wiring diagram.
First 3 links below (from our excellent ForeForum Library) might be what you seek.  Last link is to the main Library page, where you will find many folders full of potentially useful info.

https://www.foreforums.com/index.php?action=media;sa=media;in=4746

https://www.foreforums.com/index.php?action=media;sa=media;in=3856

https://www.foreforums.com/index.php?action=media;sa=media;in=3857

https://www.foreforums.com/index.php?action=media;sa=album;in=165

Re: Wiring diagrams

Reply #5 –
No juice to the hot side.  If I jump from alt post on isolator to start batt post I get juice.

Re: Wiring diagrams

Reply #6 –
What is battery voltage at chassis battery?  house battery?

Does the boost switch work?

Re: Wiring diagrams

Reply #7 –
12.7
14
Don't know

Re: Wiring diagrams

Reply #8 –
Quote from: TerryW –
No juice to the hot side.  If I jump from alt post on isolator to start batt post I get juice.
Engine running or engine off?  The center (alt) post on isolator should not be hot unless the engine is running.

Re: Wiring diagrams

Reply #9 –
Cant start engine without jumper.  I gotta trace some more cables.

Re: Wiring diagrams

Reply #10 –
Typical OEM 4-post isolator wiring connections:

Re: Wiring diagrams

Reply #11 –
Yeah, mine is 3 post aftermarket and now that I have rewired it the alt no longer charges

Re: Wiring diagrams

Reply #12 –
Where can I get a four post?

Re: Wiring diagrams

Reply #13 –
Better question...why four posts?]

Re: Wiring diagrams

Reply #14 –

The 4-post isolator fitted by the factory to older Foretravel coaches is a bit of a mystery.  Several ideas found on this Forum over the years about why...  Perhaps it was all they could get at the time - who knows?

You'll notice in the photo I posted that there is a jumper connecting the coach battery post to the "extra" 4th post on the isolator.  So the 4-post isolator still functions the same as a 3-post model.  It can be replaced with either a 3-post model or a 4-post model.  They should both work equally well.

The Victron ArgoFET 3-post 200A isolator is a excellent choice - suitable for use on any Foretravel coach.  It has virtually zero voltage loss between the alternator post and the battery posts, making it very efficient.

Amazon.com: Victron Energy Argofet Battery Isolators 200-2AC (2 Batteries...

As an Amazon Associate Foretravel Owners' Forum earns from qualifying purchases.

Re: Wiring diagrams

Reply #15 –
A photo and description of the cables at the
Isolator would be helpful.
Any paper work with the isolator?
Did it ever work correctly?

Re: Wiring diagrams

Reply #16 –
No paperwork
Don't know.  New to me.

Don't know how to add  pic.

Center post from alt
1st post to coach batt
3rd post to engine batt and dash solenoid

Re: Wiring diagrams

Reply #17 –
Quote from: TerryW –
...mine is 3 post aftermarket and now that I have rewired it the alt no longer charges.
You need to get out your multimeter and do some basic charging system trouble shooting.  The first diagram I linked in Reply #4 shows how a 3-post isolator should be connected.  After you have the battery cables connected to the isolator, then you'll need the big engine running (whatever that takes).  With engine running, you can measure and record the voltage at the following points:
1.  B+ output terminal on the alternator
2.  ALT post on the isolator
3.  COACH battery post on isolator
4.  ENGINE battery post on isolator
5.  The POS (+) post on the COACH battery bank where cable from isolator is connected
6.  The POS (+) post on the ENGINE battery bank where cable from isolator is connected
7.  BOTH of the large terminals on the ignition solenoid (under the lift-up dash cover in front of driver seat)

Let us know the results of these readings.

Re: Wiring diagrams

Reply #18 –
Quote from: TerryW –
Don't know how to add  pic.
How to add a photo when you reply to a post:
1.  Take the photo, then transfer to your computer.
2.  Click on the "Reply" button below a post to compose your reply.
3.  Look down below the box where you type your reply for "Add files by dragging & dropping or selecting them"
4.  Click on the words "selecting them"
5.  In the page that opens, navigate to the photo file on your computer.
6.  Click on the desired photo file name.
7.  At bottom right corner of page click on "upload".
8.  If the photo uploads successfully, you should see a little tiny image icon appear in the "Add files..." box.
9.  Click on "Post" button to publish your reply.
10.  Note:  You will not actually see the full sized photo until your reply is posted in the thread.

Re: Wiring diagrams

Reply #19 –
Thabk you all..

Cables are good.  Voltages are good...except no charging voltage to start batteries.  Will be testing isolater in a different way.