Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 02-26-2016, 04:51 AM   #1
Junior Member
 
Join Date: Feb 2016
Posts: 16
Generator Slow Start

Hello everyone....I would appreciate some advice/opinions about the generator on my Dad's Newmar. My father and I have traveled on many trips with his motor home and the starter on the generator has always spun slow but started. Now the starter is not spinning it engine fast enough to start. Outside of replacing the starter, I wonder if anyone else has had the issue and what remedies may resolve it. I am not reluctant to change the starter, just want to try most cost effective ways first....THANKS FOR YOUR ANSWERS.
__________________

__________________
Charles27909 is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 02-26-2016, 05:10 AM   #2
Senior Member
 
Join Date: Dec 2011
Location: Albany GA
Posts: 376
It would help if you could please post year and model of your Dad's Newmar. Generator size and make would also assist. Lots of help available with a little more information.
__________________

__________________
shaman52 is offline   Reply With Quote
Old 02-26-2016, 05:12 AM   #3
Member
 
Join Date: Oct 2015
Location: Sherman Texas
Posts: 32
I would check battery voltage to the starter first (cheap). If the volts are low this would cause a slow to no starting. Check the battery's.
__________________
Karl0525 is offline   Reply With Quote
Old 02-26-2016, 07:51 AM   #4
Senior Member
 
jacwjames's Avatar
 
Monaco Owners Club
Join Date: Jun 2014
Posts: 4,597
I have a 7.5 kw Onan. The power lugs are mounted on the bottom rear of the generator, check to make both are clean and tight. Check the voltage here to make sure you are getting power from the batteries, if not trace the wires back to where they start from.
__________________
Jim J
2002 Monaco Windsor 38 PKD
2005 Jeep Grand Cherokee w/5.7 Hemi
jacwjames is online now   Reply With Quote
Old 02-26-2016, 08:23 AM   #5
Junior Member
 
Join Date: Feb 2016
Posts: 16
Newmar Specs

Quote:
Originally Posted by shaman52 View Post
It would help if you could please post year and model of your Dad's Newmar. Generator size and make would also assist. Lots of help available with a little more information.
The motor home is a 2003 Newmar Dutch Star, 40 ft with 3 slides. 8.3 ISB Cummins and 6-speed Allison. The generator is an ONAN 10.5 KW unit.
__________________
Charles27909 is offline   Reply With Quote
Old 02-26-2016, 08:29 AM   #6
Senior Member
 
Join Date: Jul 2014
Posts: 9,838
I don't know this for sure, in this case, but some generators were equipped with independent start batteries.

If it has an independent battery, it could be bad.
__________________
twinboat is online now   Reply With Quote
Old 02-26-2016, 10:07 AM   #7
Senior Member
 
Join Date: Dec 2011
Location: Albany GA
Posts: 376
From Onan Trouble shooting manual:

Cranks Slowly
1. Low battery: Check battery fluid level.
2. Bad battery connection: Clean & tighten all battery & cable connections.
3. Incorrect oil viscosity: Replace with recommended viscosity oil.

You should be able to measure the starting voltage. Lower than 10.5 volts shows a problem. Should read at least 11.5 on a good system.
__________________
shaman52 is offline   Reply With Quote
Old 02-26-2016, 10:06 PM   #8
Senior Member
 
Join Date: Feb 2010
Posts: 4,493
If cranking slow it is LOW VOLTAGE.

Why is the puzzle.

Ours has starting and cabin batteries at the back and the genny and leveler pump is at the front.

A battery is at the front for them as it is far cheaper than the correct size wire.

Many gas class a have batteries in front and genny someplace near back and use a long cable to genny.

This cable is usually not quite large enough for proper operation.

Do the following.

Get a voltmeter and measure voltage on your starting and cabin batteries.

Next check voltage at generator.

Now have a helper hit the start button for the generator while measuring the voltage at the generator.

Next do same while measuring voltage on other batteries to determine which one it is connected to.

If you have a battery near your generator check it.

So as an example say the voltage on the cabin battery drops from 12.6 to 12 volts and the voltage at the generator is 12.6 and drops to 10 then the wire size is too small or there is a bad connection.

Check all connections and if all good then you may need to add a generator starting assist.

Try jumping the battery connection at the generator to confirm it works correctly.

You can get a 12 volt 22 amp hour VRLA battery on Amazon for about 41 bucks, we just got one for one of those portable jump start boxes.

The battery is about 7 X 6 X 3 ish.

You can place this battery near the generator and connect it with number 2 wires and if the wires are routed through any holes fuse at 100 amps on both ends of the wire.
__________________
Tony & Lori
1989 Country Coach Savannah SE
TQ60 is offline   Reply With Quote
Old 02-26-2016, 10:16 PM   #9
Senior Member
 
Mr_D's Avatar
 
Solo Rvers Club
iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 28,450
Quote:
Originally Posted by Charles27909 View Post
The motor home is a 2003 Newmar Dutch Star, 40 ft with 3 slides. 8.3 ISB Cummins and 6-speed Allison. The generator is an ONAN 10.5 KW unit.
The generator shown in the factory brochure is a 7.5Kw Generac
Here is what the '03 option list shows for generators:
Quote:
ELECTRICAL FEATURES
7.5 Onan Diesel Quiet Series Generator In Lieu Of Standard Generator 230# 3L681

8.0 Power Tech Diesel Quiet Series Generator In Lieu Of Standard 195# 3L440
In our '02 DSDP 4090 we ordered the PowerTec 8.0Kw option and the 7.5 Generac was standard.
Might want to check to be sure what unit it actually has.
Also the engine is an ISC 350, not ISB if on the Spartan chassis, if on a Freightliner it's a CAT 3126 330 HP.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
Charter Good Sam Lifetime Member, FMCA, SKP
RV'ing since 1957, NRA Benefactor Life, towing '14 CR-V
Mr_D is offline   Reply With Quote
Old 02-27-2016, 07:26 AM   #10
Senior Member
 
DDDonkey's Avatar
 
National RV Owners Club
Ford Super Duty Owner
Join Date: Dec 2013
Posts: 450
Quote:
Originally Posted by TQ60 View Post
If cranking slow it is LOW VOLTAGE.

Why is the puzzle.

Ours has starting and cabin batteries at the back and the genny and leveler pump is at the front.

A battery is at the front for them as it is far cheaper than the correct size wire.

Many gas class a have batteries in front and genny someplace near back and use a long cable to genny.

This cable is usually not quite large enough for proper operation.

Do the following.

Get a voltmeter and measure voltage on your starting and cabin batteries.

Next check voltage at generator.

Now have a helper hit the start button for the generator while measuring the voltage at the generator.

Next do same while measuring voltage on other batteries to determine which one it is connected to.

If you have a battery near your generator check it.

So as an example say the voltage on the cabin battery drops from 12.6 to 12 volts and the voltage at the generator is 12.6 and drops to 10 then the wire size is too small or there is a bad connection.

Check all connections and if all good then you may need to add a generator starting assist.

Try jumping the battery connection at the generator to confirm it works correctly.

You can get a 12 volt 22 amp hour VRLA battery on Amazon for about 41 bucks, we just got one for one of those portable jump start boxes.

The battery is about 7 X 6 X 3 ish.

You can place this battery near the generator and connect it with number 2 wires and if the wires are routed through any holes fuse at 100 amps on both ends of the wire.
I think that this is right on, basically your preforming a voltage drop on the starter, it should be .5 volts of less for the circuit (testing both pos and neg wires). It could be a bad wire, loose connection or a bad starter. The only way to test the stater is to preform an amp draw on it after the voltage drop. Let us know what your find, and good luck!
__________________
2008 National SurfSide 34E (Bunk Model) Ford V10
Sold- 1990 Hawkins Chevy P30 454
DDDonkey is offline   Reply With Quote
Old 02-27-2016, 01:05 PM   #11
Junior Member
 
Join Date: Feb 2016
Posts: 16
stand corrected...

Quote:
Originally Posted by Mr_D View Post
The generator shown in the factory brochure is a 7.5Kw Generac
Here is what the '03 option list shows for generators:
In our '02 DSDP 4090 we ordered the PowerTec 8.0Kw option and the 7.5 Generac was standard.
Might want to check to be sure what unit it actually has.
Also the engine is an ISC 350, not ISB if on the Spartan chassis, if on a Freightliner it's a CAT 3126 330 HP.
I stand corrected about the engine being an ISC. Being from the trucking world, I am used to ISX, anything else is just a small block...lol. But I am quite sure the generator is what I said....but not 100%. The next time I am over there, this week, I will double check. I appreciate all the answers and advice.
__________________
Charles27909 is offline   Reply With Quote
Old 02-27-2016, 01:22 PM   #12
Registered User
 
mel s's Avatar
 
Join Date: Mar 2010
Posts: 8,777
Quote:
Originally Posted by Karl0525 View Post
I would check battery voltage to the starter first (cheap). If the volts are low this would cause a slow to no starting. Check the battery's.
Karl0525

In my experience slow generator cranking, (or no cranking), is most often caused by:
1.) Insufficiently charged batteries...(or bad batteries)...f
2.) Poor cable connections.
3.) Bad batteries.
Mel
'96 Safari
__________________
mel s is offline   Reply With Quote
Old 02-27-2016, 09:34 PM   #13
KEH
Member
 
KEH's Avatar
 
National RV Owners Club
Freightliner Owners Club
Join Date: Oct 2014
Posts: 84
My 02 National Tradewinds has a Cummins 350 ISC and 7.5 kw Generac. I have exactly the same starting situation that your dad has experienced...over the past year the starter would turn slow before the generator would start...now it's too slow to start. I've checked voltage at the generator and it shows 13.5 v; which is what the house batteries are at while charging. I think it's the starter that 's the problem so I've started removing the generator panels to gain access to the starter. I hope to get more into it tomorrow and will let you know if I determine the cause. I can see that there's one, possibly two, solenoids in there that I haven't got to yet to check voltage.
__________________
2002 National RV Tradewinds LTC 7390
Cummins 350 ISC
Freightliner Custom Chassis
Fulltimer's - Class of 2014
KEH is offline   Reply With Quote
Old 02-28-2016, 07:05 AM   #14
Senior Member
 
Join Date: Jul 2015
Location: Watertown NY USA
Posts: 1,400
Quote:
Originally Posted by Charles27909 View Post
Hello everyone....I would appreciate some advice/opinions about the generator on my Dad's Newmar. My father and I have traveled on many trips with his motor home and the starter on the generator has always spun slow but started. Now the starter is not spinning it engine fast enough to start. Outside of replacing the starter, I wonder if anyone else has had the issue and what remedies may resolve it. I am not reluctant to change the starter, just want to try most cost effective ways first....THANKS FOR YOUR ANSWERS.
If you run all the tests suggested including a battery load test and all appears well you may not have to replace the starter. There are businesses which will disassemble and repair or rebuild starters much cheaper than replacement units will cost. Sometimes just a thorough cleaning, a new set of brushes and lubing the bearings will return the starter to like new condition. The rebuilder will test the fields and armature and clean the commutater surface. Get an estimate of repairs and compare it to the price of new before giving an OK to repairs or rebuild. It's your call.
Also don't forget to check any and all ground wires for corrosion and tightness. Does the gen set have a ground wire hooked between it and the MH chassis? Remove it and clean all contact points. Use a silicone Di-Electric grease on all terminal ends both positive and negative.
Be sure there is no corrosion buildup between the starter and the engine where the starter is mounted. Clean all surfaces well before reinstalling the starter.
Electrical circuits can be explained simply if you vision them as a circle from positive to negative. The power has to flow from the source (battery) through the starter back to the battery with a minimum of resistance to operate efficiently. This is true with any electrical device including lamps.
There is no such thing as a pretty good connection. They must be surgically clean IMO.
I mentioned the battery load test because it is the only accurate way to test batteries which are sealed. If you have multiple batteries disconnect all cables and test each battery individually. If you find one bad replace them all at the same time. The batteries will expire one by one.
Lynn
__________________

__________________
2002 Fleetwood Storm 30H on Workhorse P32 chassis 8.1 gas.
LETMGROW is offline   Reply With Quote
Reply

Tags
generator



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
1of 4 generator start switches will not start genny Jeff753 Monaco Owner's Forum 6 09-05-2013 08:07 PM
Generator Start/Start Switch Issues ExplEngineer Class A Motorhome Discussions 10 10-29-2012 11:12 AM
Diesel slow to start in cooler weather Avatar Class A Motorhome Discussions 5 08-06-2012 11:32 AM
Slow slow HP laptop wagonmaster2 Technology: Internet, TV, Satellite, Cell Phones, etc. 18 11-10-2011 10:22 AM
Air conditioner is slow to start gypsynut Winnebago Industries Owner's Forum 7 05-03-2008 12:16 PM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 09:10 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.