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Topic: 1995 U300 dropped to 8 1/2 while driving? (Read 654 times) previous topic - next topic

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1995 U300 dropped to 8 1/2 while driving?
We were headed to PA for the weekend to camp yesterday. We got off at a rest area and when we got back on the interstate the charging needle dropped to 8 1/2.
My husband thought maybe we broke a belt so we got off at next exit and headed back to...

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Re: 1995 U300 dropped to 8 1/2 while driving?
Reply #1
We have had the experience of the alternator failing.   We just start the generator, turn on the boost, and keep on going.   You can cross the country that way if everything is working like it is supposed to.

You didn't mention the isolator.  All...

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Re: 1995 U300 dropped to 8 1/2 while driving?
Reply #2
Thanks we will tell them about the isolator. I know when he turns the boost on it doesn't light up so we don't know if that's working or not.

Re: 1995 U300 dropped to 8 1/2 while driving?
Reply #3
Rick has stated (above) the standard procedure for suspected alternator failure.  Has saved many members from grief.

The transmission temp light MIGHT be due to low start battery voltage.  Running engine with low battery voltage can cause all...

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Re: 1995 U300 dropped to 8 1/2 while driving?
Reply #4
Just basic diagnostic for any tech with knowledge of DUVAC alternator and diode-based isolator.

First step is to determine whether this is a gauge reading issue or alternator/isolator/battery issue. 

When the gauge reads below 12 VDC, what is the...

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Re: 1995 U300 dropped to 8 1/2 while driving?
Reply #5
We are unsure if the boost is working. It is a 1995 U300 we bought in Ca. Drove it all the way home to Ohio in Feb with no problems. At first generator wouldn't come on it kept dropping out. I forwarded the charging diagram to the shop.

Re: 1995 U300 dropped to 8 1/2 while driving?
Reply #6
We are unsure if the boost is working. It is a 1995 U300 we bought in Ca. Drove it all the way home to Ohio in Feb with no problems. At first generator wouldn't come on it kept dropping out. I...


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Re: 1995 U300 dropped to 8 1/2 while driving?
Reply #7
We didn't have to have it towed. We sat a couple hours with generator running so it started on its own. Tow truck driver just drove behind us to the shop.

Re: 1995 U300 dropped to 8 1/2 while driving?
Reply #8
We sat a couple hours with generator running so it started on its own.
If the generator was able to recharge the depleted start battery bank, then your boost solenoid did close.

The light bulb in...

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Re: 1995 U300 dropped to 8 1/2 while driving?
Reply #9
Hope you have good luck finding your issues while on the road.

Because of the age of our coach I proactively replaced the starter, alternator(rebuild then replace)  and then the isolator with a Blue Seas battery combiner and added 340 watts of...

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Re: 1995 U300 dropped to 8 1/2 while driving?
Reply #10
We were close enough to home to drive our Jeep back home. We unloaded our clothes and food and brought it back home.

Re: 1995 U300 dropped to 8 1/2 while driving?
Reply #11
Don't let that mechanic start changing parts without someone on here approving of what they are doing.  Apparently they know about diesel trucks but not Foretravel (or any coach.).  They can really mess things up where a simple repair will have...

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Re: 1995 U300 dropped to 8 1/2 while driving?
Reply #12

We got it started again and tow truck escorted us to the shop.
Shop determined no belts are off, alternator is good, batteries are good.
They are still looking at it today.

Thanks, Susan

If " The...

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Re: 1995 U300 dropped to 8 1/2 while driving?
Reply #13
Hi Susan and Bob, I am here in Aurora, Ohio close to you. I have a 1994 U300 and have had similar problems. If you would like to give me a call I may be able to help. It is about 9:15pm Friday now, so if you want please call anytime after 7am...

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  • Last Edit: June 27, 2020, 11:17:47 am by Gerry Vicha

  • fouroureye
  • [*][*][*][*][*]
Re: 1995 U300 dropped to 8 1/2 while driving?
Reply #14
Couple years ago, I had the same issue - Low voltage... turned out to be a loose ground at the frame. Cleaned and tight, over 30k miles since

Re: 1995 U300 dropped to 8 1/2 while driving?
Reply #15
Sorry I haven't posted back. The shop thinks an isolator is bad. They are not having any luck finding one.
They called Foretravel this morning and are waiting on a call back.
I called Foretravel last Thursday when it happened and still haven't got...

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Re: 1995 U300 dropped to 8 1/2 while driving?
Reply #16
Yes, diode-based isolators are still available-- certainly not a Foretravel-specific item.

But other work arounds:

Battery combiner

Manual marine ON-OFF switch with alternator B+ and chassis battery to one lug and house battery to the other.

And, of...

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Re: 1995 U300 dropped to 8 1/2 while driving?
Reply #17
Does anyone know if the isolators are still available?
Susan,

As Brett says, you have several options if you want to (or need to) replace the OEM battery isolator on your coach.  A quick search...

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  • oldguy
  • [*][*][*][*][*]
Re: 1995 U300 dropped to 8 1/2 while driving?
Reply #18
If you hook up the 3 cables on the isolator together you can keep going and at night disconnect them so you engine battery won't
get discharged.  Google battery isolator and you will find them.

Re: 1995 U300 dropped to 8 1/2 while driving?
Reply #19
Will the Victron work with multiple batteries?
Ours has 4 house batteries and 3 start batteries.
Thanks, Susan

Re: 1995 U300 dropped to 8 1/2 while driving?
Reply #20
Will the Victron work with multiple batteries?
Ours has 4 house batteries and 3 start batteries.
Thanks, Susan

Actually you have ONE house battery made up of 4 individual batteries and ONE chassis...

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Re: 1995 U300 dropped to 8 1/2 while driving?
Reply #21
Susan,

The Victron ArgoFET 200A 2-battery isolator is functionally the same as your OEM isolator, but it also has improved the design in a couple ways.

Victron Argofet Battery Isolator
...

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Re: 1995 U300 dropped to 8 1/2 while driving?
Reply #22
Brett,
If you install a Perko manual switch instead of the isolator, is there a need for the boost solenoid?
John M.

Re: 1995 U300 dropped to 8 1/2 while driving?
Reply #23
The boost switch would be redundant (and automatic from the driver's seat). The manual switch on ON is exactly the same as a boost switch and solenoid being ON.

Re: 1995 U300 dropped to 8 1/2 while driving?
Reply #24
No, takes possible failure out of the equation. Just have to manually do it. Turn Perko switch to both.

P