RV Trip Planning Discussions

Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Monaco Owner's Forum
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 05-23-2020, 12:39 PM   #1
Junior Member
 
big ham's Avatar
 
Monaco Owners Club
Join Date: May 2015
Posts: 9
Possible Alternator issue?

My 2000 Diplomat dash volt gauge,under load and/or sitting idle, will read 13+ until I turn on the lights. It then will show 12.5 and drop below 12 with constant light usage. This makes it impossible to drive at night or in the rain. No alternator light blinks or shows. Wiper usage has the same effect.
Would this be a definate weak or failing alternator? I have changed the house and chassie batteries without any change to the issue.
__________________

__________________
2000 Monaco Diplomat
big ham 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 05-23-2020, 12:44 PM   #2
Senior Member
 
mackpeteno's Avatar
 
Country Coach Owners Club
Texas Boomers Club
Fleetwood Owners Club
Join Date: Apr 2011
Location: Snyder,Tx.
Posts: 127
Quote:
Originally Posted by big ham View Post
My 2000 Diplomat dash volt gauge,under load and/or sitting idle, will read 13+ until I turn on the lights. It then will show 12.5 and drop below 12 with constant light usage. This makes it impossible to drive at night or in the rain. No alternator light blinks or shows. Wiper usage has the same effect.
Would this be a definate weak or failing alternator? I have changed the house and chassie batteries without any change to the issue.
My 99 Country Coach is doing the same thing.Have not been able to solve it yet.
__________________

mackpeteno is offline   Reply With Quote
Old 05-23-2020, 12:53 PM   #3
Senior Member
 
Join Date: Jul 2014
Posts: 21,813
Failing alternator or loose drive belt.

Run it for 15 minutes with the lights and wipers on. Then shut down and feel the alternator pully. Caution it may be hot from slipping belt.
twinboat is online now   Reply With Quote
Old 05-23-2020, 01:04 PM   #4
Senior Member
 
Join Date: Mar 2015
Posts: 184
Check the voltage at the chassis batteries. Make sure the batteries are full and terminals are tight. If you get the same reading, then it is probably the alternator.
__________________
Stan & Mary, Maggie the Canine Princess and Lucy a Princess in Training....

2013 Holiday Rambler 36 pft, 2014 Cadillac SRX toad
36PFT is offline   Reply With Quote
Old 05-23-2020, 03:12 PM   #5
Senior Member
 
Join Date: Oct 2016
Posts: 1,190
Hi Big Ham; Agree with 36PFT. Monaco used very poor wiring and grounding on the dash gauges. I have a Silver Leaf monitor and it gives more accurate info from the engine ECM. Check the voltage at the battery terminals with the engine idling at least around 800 RPM. Add loads after you get a reading and see if the voltage continues to drop. If so, your alternator could be headed south. On my 01 Windsor I get 14.0 to 14.3V at the battery terminals when idling. I can load up the chassis electrical system, headlights, dash blower speed, wipers and etc. and still get a reading of 14.0V on my Silver Leaf and the battery terminals while the dash voltage gauge continues to drop.
8.3Oilbuner is offline   Reply With Quote
Old 05-24-2020, 05:16 AM   #6
Senior Member
 
veraken's Avatar


 
Monaco Owners Club
Vintage RV Owners Club
Holiday Rambler Owners Club
Join Date: Jul 2012
Location: Lexington, SC
Posts: 1,747
I had the same problem, turned out to be a bad alternator. I found the best price at Quality Power. I decided to replace my 160 amp Leece Neville with a 200 amp Delco Remy 28SI. The install was fairly simple except on the DR you don't connect the excite wire since it is self exciting. I had my old LN rebuilt and carry it as a spare.

https://www.qualitypowerauto.com/cat...lternators.htm

In the interim, you can run your generator to keep your battery charged.
__________________
Vera & Ken
1998 Holiday Rambler Imperial, RR8S Chassis
Cummins 6C8.3 mechanical engine, 325HP, 3060 Allison
Towing 2014 Ford Explorer
veraken is offline   Reply With Quote
Old 05-24-2020, 06:59 AM   #7
Junior Member
 
Join Date: Mar 2019
Posts: 18
Like everyone has said, check the voltage with the lights and wipers on at the batteries. If it is above 12.7v there, then you likely have a ground to the gage set that needs cleaning. If the voltage is below 12.6 at the batteries, you definitely have a bad alt or alt connection.
__________________

Cj D is offline   Reply With Quote
Reply

Tags
alternator



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
Need advice on possible engine alternator issue glennj3cub Vintage RV's 25 11-12-2019 06:25 PM
2000 Southwind house batteries not charging from alternator possible cause. Jyrocharlie Class A Motorhome Discussions 6 07-22-2019 06:03 PM
Possible Alternator Problem??? DaveBunker Monaco Owner's Forum 12 11-20-2018 11:43 AM
Alternator belt and alternator replacement jimloeh Monaco Owner's Forum 7 08-15-2016 04:10 PM
Alternator Light stays on but alternator charges augiedeg Spartan Motorhome Chassis Forum 1 10-20-2010 06:05 AM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 01:56 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
×