Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
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 04-18-2014, 06:46 PM   #1
Senior Member

Join Date: Aug 2012
Posts: 121
Alternator Grounding

I believe I have had a bad ground somewhere as the batteries were not charging much past 12.4v.
I ran a ground wire from the back of the alt to the frame and now my batteries appear to be charged at around 14.4v.
My question is: Do it hurt anything to run the ground wiring directly from the back of the alt to the frame?

Thanks, Bob

2006 Winnebago Aspect 23'
2008 Honda Civic EX (Toad)
2009 Yamaha V star 1300
Jarvis 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 04-18-2014, 06:50 PM   #2
Senior Member
wb7auk's Avatar

National RV Owners Club
Join Date: Feb 2012
Location: Spokane Valley, Wa
Posts: 1,945
No everything is right, the main problem found in a lot of cases with these coaches is poor ground connections or no grounds.
Cure the ground problems a lot of things would go away as to problems.

1999 Trade Winds 7371 Cat 3126B w/current upgrades
1990 D 250 Dodge Ram Cummins Turbo
wb7auk is offline   Reply With Quote
Old 04-18-2014, 07:10 PM   #3
Senior Member
Ford Super Duty Owner
Join Date: Jan 2011
Location: Lowell, Arkansas
Posts: 3,783
Some of this stems from the fact that the average person does not understand the importance of a ground. When a switch is turned on and current flows from a battery or alternator to its load those electrons have to get back to the negative side of the battery (I'm not going to go into does current floe from + to - or from - to + that's not really important for this discussion) If there is not a return path for electrons to flow is creates a voltage drop and loss of voltage, current and overall efficiency. The negative or ground side is equally as important as the positive side. Most don't look for or even consider looking for a ground path.

Also the fact that many devices either don't use a ground wire or also rely on the chassis of the load bolted to the metal frame which is grounded (we hope).

The best story (VERY TRUE) happened like this. My assistant principal came to me with an intermittent no-crank condition that had been going on for about 3-4 months. He had it in to 3-4 shops with no success. He had the battery replaced 3 times and had two alternators installed but would still get stuck with a no crank situation. We were studying this stuff so I went over it with the kids in class and put two on it. Within 5 minutes they came back with the problem diagnosed.

The negative battery cable connection to the block was loose. The engine would move on its motor mounts because of engine torque and it would not keep a good connection. They removed the bolt, cleaned the terminal, installed two clean washers and torqued the bolt. Problem solved.

TeJay (Tim) Auto Instructor 35 yrs (4-yrs USAF) Liz: RN/ WBGO 2014 Vista 30T/ F-53/ CHF/5-Star/Koni/Centramatics * Bella- Golden/Cocker mix & Louie-The cat / All Retired
TeJay is offline   Reply With Quote
Old 04-19-2014, 08:18 AM   #4
Senior Member
Damon Owners Club
Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 21,178
A bad alternator ground can cause all sorts of interesting things to happen.. Been there, Done that. Fixed it with a "Star" type lock washer under an alternator mounting bolt.

Can it hurt anything running a ground wire to the frame?

For quite some time I wondered why Ham Radio gear often comes with fuses in both the POSITIVE and NEGATIVE leads Well. the reasonh is this....

They are worried that since many times we hook the power leads directly to the battery starting current may try to flow via the radio's other grounds should the battery negative cable fail... That would fry the wires in most cases.

This may apply to your case as well.

That said.. Many RV type alternators are fully capable of powering a starter motor even without battery aid.. And thus will not have any problem dealing with the flow.
Home is where I park it!
wa8yxm is offline   Reply With Quote
Old 04-19-2014, 09:11 AM   #5
Senior Member
Join Date: Feb 2010
Posts: 4,282

Starter motor powered by alternator...

If not running alternator not moving.

If running starter not needed...

But the factory jumpers from block to frame have caused many issue.
Tony & Lori
1989 Country Coach Savannah SE
TQ60 is online now   Reply With Quote
Old 04-19-2014, 09:23 PM   #6
Senior Member

Join Date: Aug 2012
Posts: 121
Thanks for all the replies that confirmed what I thought.


2006 Winnebago Aspect 23'
2008 Honda Civic EX (Toad)
2009 Yamaha V star 1300
Jarvis 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

» 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 09:36 PM.

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