Go Back   iRV2 Forums > iRV2.com COMMUNITY FORUMS > New Member Check-In
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
  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 07-02-2010, 06:25 AM   #1
Junior Member
Join Date: Jul 2010
Posts: 3
Question battery discharge

Can some one tell me why mycranking battery discharges after a few days.
I have a pace arrow 1983 29 ft 454 engine, battery charges up but discharges after a few days. Thanks for any help

pacesetter 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 07-02-2010, 06:47 AM   #2
Senior Member
RJay's Avatar
Newmar Owners Club
Join Date: Jan 2010
Posts: 4,589
Hi pacesetter, Welcome.
On my 2000 suncruiser I had to install one of these. It seems the chassis battery isn't charged when connected to shore power and this device solves that problem. However you don't say your connected to shore power so I'm assuming that it loses charge after it just sits a few days after use. You may have some parasitic discharge going on, something wired directly to the battery system instead of thru the ignition. It could also be a short somewhere.

2007 Newmar DSDP 4023
Discovery is seeing what everyone else has seen and thinking what no one else has thought.
If you want to see what man made go East; if you want to see what God made go West.
RJay is offline   Reply With Quote
Old 07-02-2010, 07:40 AM   #3
Community Moderator
Petro's Avatar

Winnebago Owners Club
Freightliner Owners Club
Join Date: Dec 2003
Location: Weyauwega, WI US
Posts: 5,216
Originally Posted by pacesetter View Post
Can some one tell me why mycranking battery discharges after a few days.
I have a pace arrow 1983 29 ft 454 engine, battery charges up but discharges after a few days. Thanks for any help
First I would like to welcome you to iRV2. We are glad you joined us. You could have several problems causing your battery drain. I would encourage you to visit our MH - Problems, Solutions, & After Market forum HERE You should receive more replies there.

Don & Bev Morgan Weyauwega WI, 05 Itasca Horizon 40KD, 400 HP Cummins, Delorme GPS LT 40, Toad 07 Saturn Vue AWD, Air Force One, TST 510 TPMS, Mayor of Weyauwega 2007 - 2013, Waupaca Co Board Supervisor 2010 - 2014
Petro is offline   Reply With Quote
Old 07-02-2010, 12:49 PM   #4
Moderator Emeritus
Gary RVRoamer's Avatar

Fleetwood Owners Club
Freightliner Owners Club
Join Date: Jan 2000
Location: Silver Springs, FL. USA
Posts: 16,446
His Pace does indeed charge the chassis battery while on shore power, so that's not it.

The parasitic drain on a old Pace Arrow ought not to drain the battery that quickly - should last for weeks. How old is this battery? Have you had it load-tested? Most auto parts stores will do that for free.
Gary Brinck
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL
Gary RVRoamer is offline   Reply With Quote
Old 07-02-2010, 05:57 PM   #5
Senior Member
Join Date: Feb 2010
Posts: 4,282
Exclamation Measurements to be made

Get a volt meter that also has an amp meter function, one that will measure 10 amps, money well spent.

Now make the following measurements
1. Voltage before starting, should be 12.6 volts or better.
2. Voltage while cranking, should NOT be below 10 volts or so.
3. While engine is running at fast idle voltage should be between 13.6 and 14.6 volts, any higher is over charged and lower is not charging enough.
If above 12.8 and below 13.6, turn on lights, if drops down shut off engine and verify alternator belt is tight, try to turn pully, if pully turns or slips in belt it is too loose, if old replace belt, if not old tighten until pully does not slip, then re-test.

If all above passes turn EVERYTHING off...EVERY switch.

Remove the negative wire from the post, count to 10 and touch it back, if large spark then large load, if small spark it could be filter cap in stereo.

Now switch meter to measure amps, place black lead on battery and red lead on wire, this is the amount of parasitic load, depending on what you have connected this may vary from zero to about an amp or so.

Remember you should have everythig turned off so only memory loads should be present.

You may want to add an additional small battery specific for your alarm, stereo and other MBS or add a trickle charger to the starting battery to supply the loads and maintain the charge.

A normal car battery is in the range of 70 to 90 amp hour capacity, is we assume it takes only 25% of the charge to start the vehicle, and the battery is GREAT, then using a 90 amp battery you have about 65 amp hours of capacity.

Multiply the amps you measure by the amount of time between when the engine is running and that is the capacity of the battery that is consumed by the parisitic loads.

Also consider the alternator takes many hours to fully charge the battery, it must return the capacity consumed by starting as well as the parisitic loads, and given the nature of how a battery works, the charging current of the alternator will go down as the charge in the battery rises, so if ne has a 100 amp alternator it is only putting out 100 amps when the battery is near dead, as the battery charges the current is much less, it could take many hours to fully charge a dead battery.

One could place a trickle charger on the battery for a few days, disconnect the charge and after about 2 hours the float charge should be gone, the voltage should be 12.8 or so indicaing a FULL CHARGE.

If the battery has bad plates but the cells are not shorted it still can indicate a full charge, but with bad plates the capacity is greatly reduced.

So if the batteyr is over a couple years old and the measurements above do not indicate too high of a parasitic load while everything else looks ok (charging voltage etc) it might be a good idea to just change out the battery and be done.
TQ60 is offline   Reply With Quote
Old 07-04-2010, 10:22 AM   #6
Junior Member
Join Date: Jul 2010
Posts: 3
I have a new battery,when I camp for a couple of weeks my cranking battery goes down to where it will not start the motor without help from the coach battery's. Every thing is off from the cranking battery, we don't play the radio.
I have a clock that runs all the time could this be running down the battery, the battery is a 1000 am cranking battery that I just replaced new.
I usually disconnect the positive cable but I would like to know what is causeing my problem. Thank all of you for your help
pacesetter is offline   Reply With Quote
Old 07-04-2010, 10:25 AM   #7
Junior Member
Join Date: Jul 2010
Posts: 3
When I am camping I am hooked to the campsites electric which keeps the coach battery's charged but does not charge my cranking battery.
pacesetter is offline   Reply With Quote
Old 07-04-2010, 01:01 PM   #8
Senior Member
bigskymt's Avatar
Newmar Owners Club
Join Date: Apr 2010
Posts: 462
I don't believe your converter is set up to charge the chassis battery on that model coach. As TQ60 suggested you should remove a battery cable and install an ammeter between the cable and battery post.............a test light will also indicate a draw.......the brighter the light the more draw.
It's possible someone connected something from the house to the chassis battery via the fused battery terminals on the fuse block.
Is your step electric or vacuum?
It's also possible the alternator has a shorted diode that could be drawing current. On your model I believe the alternator output runs to the battery isolator on the firewall, if you disconnect that wire from the isolator you should eliminate the alternator from the circuit.

bigskymt is offline   Reply With Quote

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
Rapid battery discharge Mr V Monaco Owner's Forum 5 06-06-2010 08:18 PM
Installation of Chassis Battery Bus Bars - Journey 36G SteveG Winnebago Industries Owner's Forum 10 03-31-2009 07:08 PM
battery discharge arknphyl Newmar Owner's Forum 6 12-27-2008 06:58 AM
Deep Cycle Battery Replacement DriVer Technology: Internet, TV, Satellite, Cell Phones, etc. 32 11-10-2008 12:37 PM
Engine Battery Discharge..tryign to find culprit Matt1616 Winnebago Industries Owner's Forum 9 11-05-2005 05:30 AM

» Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 05:03 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.