Free 7 Day Trial RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > RV SYSTEMS AND TECHNOLOGIES FORUMS > RV Systems & Appliances
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 07-02-2013, 08:46 AM   #1
Senior Member
 
National RV Owners Club
Spartan Chassis
Join Date: Mar 2011
Posts: 678
Battery Amps

My Generac 75D won't crank but just tries to like it is not getting enough amps. It has cranked and run fine in recent weeks. I do use the preheat switch before trying to start.

I believe the 4 6v house batteries are powering the gen starter. I also have 2 chassis batteries that I don't think are related to this issue. Although, I have tried the Boost switch when cranking but no change.

What is the best way to determine if there are enough amps getting to the gen? I have cleaned all the contact points that I can find including the battery terminals. I am getting 13.2v at the gen + stud bolt.

Is there a test I can do to determine if it is the battery bank or the gen itself? All house 12v items function properly and the wall control panel shows the batteries are fully charged.

I would prefer not to disassemble the battery bank and take each one some place to have it load tested if I can avoid it.

Thanks,

John
__________________
John & Deanie, Corky and Benji (best buddies)
2001 National Marlin 390 DP
"Try to live up to your dog's opinion of you."
zzjea 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 07-02-2013, 11:15 AM   #2
Senior Member
 
BFlinn181's Avatar
 
Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 19,927
I think you could start by disconnecting the 4 batteries and check voltages of each battery. If you determine a significant difference in each battery, then haul them out and have them load tested. You could also do a specific gravity test on each cell to determine if you have bad cells or batteries. The SG test doesn't require disconnecting the batteries. You could also disconnect generator and jump start it with a known good 12 v battery to see if it starts on that. If it doesn't, I'd then suspect the generator starter or start circuit.
__________________

Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
BFlinn181 is offline   Reply With Quote
Old 07-02-2013, 12:01 PM   #3
Senior Member
 
National RV Owners Club
Spartan Chassis
Join Date: Mar 2011
Posts: 678
Quote:
Originally Posted by BFlinn181 View Post
I think you could start by disconnecting the 4 batteries and check voltages of each battery. If you determine a significant difference in each battery, then haul them out and have them load tested. You could also do a specific gravity test on each cell to determine if you have bad cells or batteries. The SG test doesn't require disconnecting the batteries. You could also disconnect generator and jump start it with a known good 12 v battery to see if it starts on that. If it doesn't, I'd then suspect the generator starter or start circuit.
THANKS. I will try one or more of these ideas.
__________________
John & Deanie, Corky and Benji (best buddies)
2001 National Marlin 390 DP
"Try to live up to your dog's opinion of you."
zzjea is offline   Reply With Quote
Old 07-02-2013, 12:14 PM   #4
Senior Member
 
wb7auk's Avatar
 
National RV Owners Club
Join Date: Feb 2012
Location: Spokane Valley, Wa
Posts: 1,987
A easy way to check the cranking voltage at the genset is have someone try to start it
and you look at the voltage at the genset. should be above 11 volts while cranking.
__________________
Art
1999 Trade Winds 7371 Cat 3126B w/current upgrades
1990 D 250 Dodge Ram Cummins Turbo
wb7auk is offline   Reply With Quote
Old 07-02-2013, 02:35 PM   #5
Senior Member
 
Join Date: May 2011
Location: Port Dover, Ontario
Posts: 431
175 Amp fuse blows when starting.

My neighbours RV has a similar problem and they always come to me for repairs.
They have a Fleetwood on a Sprinter Chassis with an Onan Diesel Generator.
Unless the Chassis battery is right up to 100% or the engine is running the generator will blow the 175 Amp Buss Fuse.
All the connections have been cleaned.
Seems inconvenient to start the engine just to boost the battery so you can start the generator to charge the battery.
At 20 dollars a pop getting a little pricey as well.
I wonder if a heavier gauge cable should be run straight from the battery to generator rather than being switched by all the relays in the chassis electrical system.
harris155 is offline   Reply With Quote
Old 07-02-2013, 04:38 PM   #6
Senior Member
 
clyon51's Avatar
 
Monaco Owners Club
Join Date: Mar 2012
Location: Angola State Prison - Murder
Posts: 4,230
I would go right to the generator's ground on the chassis frame, the main problem with generator cranking.
__________________
John & Clare Lyon
2007 43.5' Monaco Dynasty Palace III (All Electric)
Towd: 2011 Chevy Equinox
clyon51 is offline   Reply With Quote
Old 07-02-2013, 07:41 PM   #7
Senior Member
 
wa8yxm's Avatar
 
Damon Owners Club
Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 24,023
To see if there are enough amps to the genny measure voltage AT the generator while cranking. If it does not change the problem is in the generator, If they drop to like 3 the problem may still be in the generator. But is more likely "Up-stream".
__________________
Home is where I park it!
wa8yxm is offline   Reply With Quote
Old 07-02-2013, 07:53 PM   #8
Senior Member
 
BFlinn181's Avatar
 
Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 19,927
I believe clyon51 is on to something, If you have a poor ground between the generator and the frame (ultimately the batteries) you'll have starting issues. Check ground strap between generator and frame / battery. A quick test before unbolting and wire brushing everything would be to use a jumper cable between generator frame and negative battery or RV frame and try to start. If it turns over faster, you know the ground is the issue.
__________________

Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
BFlinn181 is offline   Reply With Quote
Old 07-05-2013, 09:18 PM   #9
Senior Member
 
National RV Owners Club
Spartan Chassis
Join Date: Mar 2011
Posts: 678
I'm still here

Haven't been able to try these tests yet due to several issues but will let you know what works.

John
__________________
John & Deanie, Corky and Benji (best buddies)
2001 National Marlin 390 DP
"Try to live up to your dog's opinion of you."
zzjea is offline   Reply With Quote
Reply

Tags
battery



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


» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 05:12 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.