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Foretravel Owners' Forum

Foretravel Motorhome Forums => Foretravel Tech Talk => Topic started by: TGordon on June 30, 2018, 02:53:59 pm

Title: New alternator now the engine will not shut down - U320 1996 with a 1999 ISM
Post by: TGordon on June 30, 2018, 02:53:59 pm
Puzzling - Comments Please
Title: Engine shutdown problem
Post by: TGordon on June 30, 2018, 02:59:51 pm
Installed a new alternator. It works... Now the engine will not shutdown.....

Comments Please....😬
Title: Re: New alternator now the engine will not shut down - U320 1996 with a 1999 ISM
Post by: DavidS on June 30, 2018, 03:10:51 pm
Ignition switch? Cut the fuel off
Title: Re: New alternator now the engine will not shut down - U320 1996 with a 1999 ISM
Post by: craneman on June 30, 2018, 03:14:13 pm
Probably the wrong alternator, not DUVAC. Unhook the alternator and if everything works you know where the problem is.
Title: Re: New alternator now the engine will not shut down - U320 1996 with a 1999 ISM
Post by: wolfe10 on June 30, 2018, 03:28:10 pm
Yup, the ignition wire may be hooked up to the wrong terminal of the alternator.  So it is back-feeding the ignition.

It will be one of the small wires-- your wiring schematic will have the number on it.
Title: Re: New alternator now the engine will not shut down - U320 1996 with a 1999 ISM
Post by: TGordon on June 30, 2018, 04:02:33 pm
Our thoughts too, we swapped the wires, then it would not charge
Title: Re: New alternator now the engine will not shut down - U320 1996 with a 1999 ISM
Post by: wolfe10 on June 30, 2018, 04:15:04 pm
First, verify that you do have the proper DUVAC alternator.

Then make sure it is wired correctly.  Often, the small signal wire from chassis battery side of the battery isolator to alternator sense terminal is broken or not hooked up properly.
Title: Re: New alternator now the engine will not shut down - U320 1996 with a 1999 ISM
Post by: Twig on June 30, 2018, 05:10:45 pm
Would also help if we knew which motorhome you are working on.
Title: Re: New alternator now the engine will not shut down - U320 1996 with a 1999 ISM
Post by: wolfe10 on June 30, 2018, 05:13:19 pm
Title is: U320 1996 with a 1999 ISM

But agree,  it WOULD be better if he completes his coach identification in his signature.
Title: Re: New alternator now the engine will not shut down - U320 1996 with a 1999 ISM
Post by: Chuck & Jeannie on June 30, 2018, 06:15:09 pm
TGordon,

Incorrectly wired alternators are a common problem.  If there is any question in your mind about the term "DUVAC" then the thread linked below might be helpful.  If you are totally conversant with the concept, then ignore my input.

What is DUVAC? (http://www.foreforums.com/index.php?topic=33250)
Title: Re: New alternator now the engine will not shut down - U320 1996 with a 1999 ISM
Post by: Twig on June 30, 2018, 11:56:23 pm
Quote from: wolfe10 –
Title is: U320 1996 with a 1999 ISM

But agree,  it WOULD be better if he completes his coach identification in his signature.

oops.
Title: Re: New alternator now the engine will not shut down - U320 1996 with a 1999 ISM
Post by: John44 on July 01, 2018, 05:50:52 pm
Give a little history of the new alternator,is it the exact same replacement,is it a upgrade,did you install or a shop?What was the problem with the old one?
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