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 12-27-2010, 11:07 PM   #1
Junior Member
 
rv4dnp's Avatar
 
Monaco Owners Club
Join Date: Jul 2010
Posts: 11
Voltage meter problems

On start-up my voltage meter 0n the dash moves to about 14 volts then drops to 10 volts then rises again to about 14 volts and stays there while driving...is this an alternator problem/regulator problem?
__________________

__________________
Dennis & Pat Repasi (RV4DNP) AND Sparky
2004 Monaco Windsor w/
2007 FJ Cruiser
rv4dnp 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 12-28-2010, 09:32 AM   #2
Moderator Emeritus
 
Gary RVRoamer's Avatar


 
Join Date: Jan 2000
Location: Silver Springs, FL. USA
Posts: 18,096
If it stays ok after the initial sequence, I wouldn't worry too much.

I wonder if the 10v reading could be when the relay closes to charge the house batteries. Maybe a bad isolator or bad house battery drags the voltage down. That should cause the relay to open up again, letting it return to the normal range.
__________________

__________________
Gary Brinck
Former owner of 2004 American Tradition
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC
Gary RVRoamer is offline   Reply With Quote
Old 12-28-2010, 10:13 AM   #3
Senior Member
 
dons2346's Avatar
 
Country Coach Owners Club
Join Date: Dec 2010
Posts: 4,491
Your oil pressure switch could be going bad. Mine did the same thing and replacing the pressure switch fixed it.
__________________
dons2346 is offline   Reply With Quote
Old 12-28-2010, 03:58 PM   #4
Moderator Emeritus
 
Mike Canter's Avatar


 
Join Date: Apr 2008
Location: Freeport, ME
Posts: 4,707
Don. you will have to explain the relationship of the oil pressure switch to the alternator output volts for us. Not sure that I understand that but I learn something everyday. What oil pressure switch are you talking about?
__________________
Mike Canter
"Gunner" USN Retired, Airdale
2004 Monaco Signature 44' Conquest. Detroit 60
Mike Canter is offline   Reply With Quote
Old 12-28-2010, 06:39 PM   #5
Senior Member
 
GaryKD's Avatar
 
Newmar Owners Club
Join Date: Jul 2006
Location: Wellington, Florida
Posts: 12,324
Hi rv4dnp,
Mine does the same as mentioned in your OP. It has done this since it was new. I have been told (by other coach owners in our club chapters) theirs' does the same thing.

After 67K miles and 5+ years, I no longer worry about it.
__________________
Gary
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
The Avatar Is Many Times Around The USA
Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours
GaryKD is offline   Reply With Quote
Old 12-28-2010, 08:41 PM   #6
Member
 
beejay25's Avatar
 
Join Date: Jan 2008
Location: PA
Posts: 47
RV4DNP I bet you have a Cummins diesel in your motorhome. The voltage swing is your electric intake heater going off and on until engine reaches a certain temperature, shows up in cold weather along with longer wait to start times.

beejay25
__________________
beejay25 is offline   Reply With Quote
Old 12-28-2010, 09:08 PM   #7
Senior Member
 
dons2346's Avatar
 
Country Coach Owners Club
Join Date: Dec 2010
Posts: 4,491
Quote:
Originally Posted by Mike Canter View Post
Don. you will have to explain the relationship of the oil pressure switch to the alternator output volts for us. Not sure that I understand that but I learn something everyday. What oil pressure switch are you talking about?
On some coaches,the alternator is put on line when the engine has sufficient oil pressure. If the engine RPMs are low, the oil pressure will be low and the oil pressure switch will not allow the field (I think) to energize. You would have to look at your chassis schematics to see if your coach works this way. Some coaches have a pressure switch for the ECM and another for the gauges like mine does. That is the reason you can see a difference of pressures on the Silverleaf and the dash gauge. It is the ECM gauge that is the important one as it will shut your engine down when it sees low pressure.
__________________
dons2346 is offline   Reply With Quote
Old 12-30-2010, 08:18 AM   #8
Moderator Emeritus
 
Mike Canter's Avatar


 
Join Date: Apr 2008
Location: Freeport, ME
Posts: 4,707
Don, on every diesel I have owned or operated the oil pressure goes real high on initial startup until normal operating temps are reached. If there is a low oil pressure indication that is real or false then most ECU's will turn on a STOP ENGINE light and derate the motor. If the idle rpm is low then there is something wrong because that is also controlled by the ECU and if a problem will issue a CHECK ENGINE light. I checked the wiring diagrams for my MH and I have no such circuit in mine.
__________________

__________________
Mike Canter
"Gunner" USN Retired, Airdale
2004 Monaco Signature 44' Conquest. Detroit 60
Mike Canter is offline   Reply With Quote
Reply



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
High voltage from alternator RickyR Caterpillar Engine Forum 6 11-12-2010 03:40 PM
Onan low voltage UltraKen RV Systems & Appliances 8 07-10-2010 04:33 AM
House Battery Voltage Drop? Ronnie Bledsoe 2006 Dutchstar 43' MH-General Discussions & Problems 10 12-15-2009 09:25 PM
Voltage Too Low for an Autotransformer Jackm RV Systems & Appliances 15 11-26-2009 07:50 PM
RVer's problems not resolved?????!!!! "007" Workhorse and Chevrolet Chassis Motorhome Forum 8 01-22-2005 07:03 AM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 04:24 PM.


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