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Old 06-09-2015, 05:28 AM   #1
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Alternator not putting out.

2013 Fleece would Expedition, 6.7 ISB Cummins.

Most recent incident in a long list.

On the way home from visiting the grandchildren, and their parents, we got a low battery warning on the dash display. I started the generator and the voltage came back up, we made it home ok. Once parked, I turned off the genny and attempted the slides with the engine running as normal, and they wouldn't go out, low voltage, needs over 13 v. Read 12.6 on the meter panel.

We have 4 6v engine/chassis batteries, 2 6v and an inverter for the residential fridge, and 2 6v and another inverter for the rest of the coach.

Testing showed-
With genny running or shore power, and engine off, all sets of batteries read above 13.4 v.
Unplug shore power and/or turn off genny the batteries held well over 12 v.
Start the engine and the chassis batteries would start to immediately drop.
Pulled up floor panel and measured voltage on alternator posts and it dropped from 12.5ish, just like at chassis batteries.

So, new alternator!??
It is under warranty and I am going to call the Cummins repair shop. It is going to be a bugger of a job to change.

As always, thank you for your support. And ideas.
Walt B
NE LP MI


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Old 06-09-2015, 08:00 AM   #2
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No sure on your coach but my coach does have a fuse that I believe provides power to the alternator "excitor" to make it work. If the fuse is blown the alternator will not work. My fuse is located in the electrical run bay near the disconnects.

Yours may be different
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Old 06-09-2015, 08:16 AM   #3
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Cummins isn't the warranter for the alternator - they just make engines. The alternator was added by the chassis manufacturer, which was probably Freightliner Custom Chassis.

A failed diode is a common problem with alternators. output voltage remains ok but very little current (amps) is produced and the batteries run down, dropping the voltage along with it.
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Old 06-09-2015, 08:17 AM   #4
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While not in a MH, the alternator in my truck is easy to access. If the MH is still under warranty, then let the shop take care of it.
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Old 06-09-2015, 08:31 AM   #5
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I'm on my 4th alternator now.
3 of them quit charging over 12.5V the last one(5/15) the regulator went haywire charging at 15 to 16.4V at times.
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Old 06-09-2015, 10:55 AM   #6
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I think your quick check at the alternator tells the story. I'd bet on the voltage regulator.

In any case, if you find the coach is going to be tied up for an unacceptably long time while waiting for repair, this generally isn't a terribly expensive repair - other than possibly getting the alternator removed and reinstalled after service. Point being, if you have a good local truck shop available, you might talk to them about it. If reasonable, maybe you can seek reimbursement (full or partial) under warranty?

Did ours not too long ago, and yes, it was a bugger getting the alt. on and off, but it only cost me 125. to have it completely rebuilt at a local shop. Might be something to keep in mind while you're figuring out what to do. -Al
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Old 06-09-2015, 11:03 AM   #7
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There is a spot labelled for an alternator fuse in an external fuse box, but no fuse or connector. I'll try to find the exciter fuse. Where is it or where does it connect? The alternator seems to not be putting any voltage out. I talked to Cummins and they hemmed and hawed. It needs to be fixed so, we'll deal with the warranty later.


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Old 06-09-2015, 11:09 AM   #8
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I just couldn't resist myself when I read the title of this thread.

Maybe a nice dinner and some sweet talk could help!
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Old 06-09-2015, 11:26 AM   #9
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Quote:
Originally Posted by CFDfireman90 View Post
I just couldn't resist myself when I read the title of this thread.

Maybe a nice dinner and some sweet talk could help!
Me, too! I was thinking a couple of drinks and tell her she's pretty.
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Old 06-09-2015, 01:17 PM   #10
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You might try to trace each of the wires connecting to the alternator to see if there is an in line fuse on one of the small ones.
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Old 06-09-2015, 09:55 PM   #11
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If you pull the smaller lead from the alternator, that wire should turn on and off with the key. If it does that, the fuses/whatever are fine.
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Old 06-10-2015, 06:59 AM   #12
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Alternator not putting out.

It was intentional. I figured most would understand immediately! I have to laugh to keep from crying, this coach has bee a POS from the get go.
I'll check for that wire tonight. We have the mo Hoe scheduled for a visit next Wed.


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Old 06-10-2015, 04:20 PM   #13
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Alternator not putting out.

I could not see another smaller wire besides the ground and hot leads. The bundle of wires goes elsewhere. I did see this port, I removed and relaced it's little cover:
Click image for larger version

Name:	ImageUploadedByiRV2 - RV Forum1433971107.576383.jpg
Views:	60
Size:	118.3 KB
ID:	96847

And this is the model of the alternator:
Click image for larger version

Name:	ImageUploadedByiRV2 - RV Forum1433971155.052044.jpg
Views:	54
Size:	217.4 KB
ID:	96848

I am going to call the repair shop with the number.


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Old 06-10-2015, 04:50 PM   #14
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Alternator not putting out.

Will this work?

https://truckpartsinventory.com/parts/details/80771677


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