RV Trip Planning Discussions

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 07-20-2019, 12:47 PM   #1
Senior Member


 
Join Date: Jun 2009
Location: Madison, Ga
Posts: 180
Alternator on 2000 Harney coach 3126B cat

I just checked my alternator and it is putting out over 14 volts with nothing on, When I turn the headlights or the a/C on the volt meter on the dash drops to7 to 9 volts. The batteries are 21 months old and show 13.5 volts at rest.
I am not an electrician so any advice will be helpful. Is there something that is supposed to make the alternator increase the output when a load is placed on the batteries.
Thanks
__________________

busyguy 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 07-20-2019, 02:44 PM   #2
Senior Member
 
Join Date: Jul 2014
Posts: 19,129
Batteries only show 12.7 volts at rest. If your showing more, something is charging them or has been an hour or 2 before you tested them. Anything over 12.7 is a surface charge that will drop off.

14 volts right at the alternator output is good.

Your low reading on the dash volt meter makes me suspect a bad ground to the dash, if everything still works, while reading that low.
__________________

twinboat is online now   Reply With Quote
Old 07-20-2019, 04:08 PM   #3
Senior Member
 
Join Date: Sep 2009
Location: Central Indiana
Posts: 607
We had a 1999 Harney Coach Renegade with the same 3126B CAT engine. We averaged 10.3mpg. We have a 2006 with a C-7 CAT and get 6.7mpg. We did travel more than130k miles though.
Safe travels.
mrboyer is offline   Reply With Quote
Old 07-20-2019, 05:32 PM   #4
Senior Member
 
Freightliner Owners Club
Join Date: Apr 2004
Location: Foothills, Yuma, Az
Posts: 990
With no power to the coach, start engine, measure voltage at batteries.
__________________
Dale&Susan, 08 Alfa Gold, DaGirlsRv Blog
2015 F-150XLT_1600W Solar_880 AmpHr
Magnum_MSH 3812 & PT100
gatorcq is offline   Reply With Quote
Old 07-20-2019, 06:41 PM   #5
Senior Member


 
Join Date: Jun 2009
Location: Madison, Ga
Posts: 180
Thanks , did that. I think I have a bad ground for the dash instruments and will be checking that tomorrow.
busyguy is offline   Reply With Quote
Reply

Tags
alternator, cat



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
CAT 3126B will not start need input on two CAT service centers (Gilroy CA) NathanJS Caterpillar Engine Forum 23 07-23-2016 10:31 AM
2000 Cat 3126B Will Not Start GaDawgFan Caterpillar Engine Forum 16 10-02-2015 02:43 PM
2000 Harney Coach Model: Riata 38' one slide out ucaseal Class A Motorhome Discussions 3 04-18-2015 08:26 PM
Harney owners or repair tech that knows about Harney coachs sneice MH-General Discussions & Problems 2 07-12-2014 09:51 PM

» Featured Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 04:02 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
×