Reply
 
Thread Tools Display Modes
Old 02-26-2016, 11:27 AM   #1
Member
 
Join Date: Feb 2016
Posts: 58
How many amps needed to jump start diesel?

Hi All:

New to RVing (pu the Prism tomorrow if the PDI goes well) and as part of my 'preparing for the worst' decided to buy a jump start powerpack just in case we kill the chassis battery in our noob ignorance.

Wondering, tho, how many amps are needed to kick off the MB diesel engine as they are extremely high compression.

The range of available ones are quite vast and don't want to think I've got enough juice only to figure out I don't when I really need it.

thanks!
__________________

__________________
Byron in TX is offline   Reply With Quote
Old 02-26-2016, 08:14 PM   #2
Senior Member
 
namusmc's Avatar
 
Join Date: Sep 2014
Location: Grass Valley, CA
Posts: 146
Best wishes to you and your new Prism. That is one sweet rig.
__________________

__________________
namusmc is offline   Reply With Quote
Old 02-27-2016, 06:15 AM   #3
Senior Member
 
MarsMan's Avatar
 
Join Date: Jul 2015
Location: Maritime Provinces
Posts: 238
Congrats! It is too bad MBS does not have the "boost" feature for the chassis. I have seen some work arounds on the forums. I installed a trik-L-Charger to keep the chassis battery topped up when I am plugged in or charging the coach with solar. I also carry a set of booster cables. You only need to connect the pos post on the coach to the pos boost post under the hood. The whole system shares the ground.

Good luck w the PDI- Make sure they physically show you how to operate the systems (not just tell you). There is a breaker on the Onan, the plug must be in the outlet in the elect compart etc. There was no owners manual for my 2015 Prism. I downloaded the generic from this forum or from Coachmen. any questions just ask me had mine for a year.
__________________
MarsMan

2015 Coachmen Prism 24J MBS
USN-R '01-present
MarsMan is offline   Reply With Quote
Old 02-27-2016, 07:12 AM   #4
Senior Member
 
Join Date: Feb 2016
Posts: 318
The amps required buy the starter very by the engine size/type. We can usually jump them with a 550 amp jump pack if slow cranking. If the batteries are completed flat it takes two 550 jump packs or a big 900 we have in our shop.
Best of luck on the new rig.
__________________
Mars is offline   Reply With Quote
Old 02-27-2016, 07:20 AM   #5
Senior Member
 
Join Date: Jun 2015
Posts: 542
Quote:
Originally Posted by MarsMan View Post
Congrats! It is too bad MBS does not have the "boost" feature for the chassis. I have seen some work arounds on the forums.
Don't know about the Prism. Do you have a battery control center similar to this one on the Forester/Solera/Sunseeker MBS? If so, all the circuitry, save for a fuse, some wire and a switch - are already in place. This panel is located on the left side of the footwell as you enter from the RV main door. A picture of the cover, which has been removed, is attached.

I'm working on the writeup on how to hook up the existing circuitry to add the boost feature. BTW, this feature IS being installed from the factory on the Dynamax Isata 3 - also now a FR product.
Attached Thumbnails
Click image for larger version

Name:	IMG_1999.jpg
Views:	117
Size:	449.8 KB
ID:	100531  
__________________
KatanaPilot is offline   Reply With Quote
Old 02-27-2016, 07:29 AM   #6
Senior Member
 
Blackrock's Avatar
 
Join Date: Jul 2012
Location: SE Arizona's Gila Vally
Posts: 689
If the batteries are stone cold dead they usually need to be charged up before trying to start the engine. If there is enough charge to get a clickety - clikety sound a 550 amp pack should work. On a good day
I have the 12v battery charger cord setup for my Honda EU2000 generator as a backup.
__________________
2016 RAM 1500 - 2016 Keystone Laredo 265SRK
The road goes on forever and the party never ends.
Blackrock is offline   Reply With Quote
Old 02-27-2016, 12:59 PM   #7
TARVIDSON
 
Join Date: Jan 2015
Location: Missoula, Mt
Posts: 107
Jumpers will reach from the house batteries to the Chassis battery, a bit time consuming to get to the chassis battery. I have never had trouble with the chassis battery running down. There is very little load on it while camping, I keep a couple phones plugged in. In the winter I take it out for a drive every couple months, no problems.
__________________
TARVIDSON is offline   Reply With Quote
Old 02-27-2016, 04:50 PM   #8
Senior Member
 
DaveSchwartz's Avatar
 
Join Date: May 2014
Location: Waterloo Region
Posts: 717
When using any form of jump starting (portable pack, second vehicle) after you connect the cables to the vehicle to be started you should try to let its battery charge from the jump source for a few minutes. That will often put enough of a charge in the flat battery so it doesn't need to draw so much across the cables when starting. It would have to be a very large portable pack to be able to provide all the instantaneous starting current on its own.
__________________
2015 Rockwood Signature UltraLite 8282WS Platinum, GY Marathon LRD, TST 507RV TPMS
2005 GMC 2500HD CCSB D/A, Curt E16, Prodigy P2, Garmin RV760LMT w/BC-20 b/u cam

Self restraint is for the young. I'm old and want it NOW!
DaveSchwartz is offline   Reply With Quote
Old 02-29-2016, 09:34 AM   #9
Senior Member
 
Join Date: Mar 2014
Posts: 1,748
Quote:
Originally Posted by TARVIDSON View Post
Jumpers will reach from the house batteries to the Chassis battery, a bit time consuming to get to the chassis battery. I have never had trouble with the chassis battery running down. There is very little load on it while camping, I keep a couple phones plugged in. In the winter I take it out for a drive every couple months, no problems.
X2. You won't be wearing down your chassis bat. Just buy one of these and check periodically your batts status ( house and chassis ) LED Auto Car Truck Cigarette Lighter Volt Voltage Meter Monitor Tester 12V 24V | eBay and calibrate it against a known voltage. As an example mine reads point two volts lower than actual charge . Then use this chart battery charge chart - Bing images your good to go. If that still doesn't put you at ease, try scotch!
__________________
Still Kickin is offline   Reply With Quote
Old 02-29-2016, 12:10 PM   #10
Senior Member
 
bob dirt's Avatar
 
Join Date: Jan 2016
Location: Phoenix, Arizona
Posts: 293
Quote:
Originally Posted by KatanaPilot View Post
Don't know about the Prism. Do you have a battery control center similar to this one on the Forester/Solera/Sunseeker MBS? If so, all the circuitry, save for a fuse, some wire and a switch - are already in place. This panel is located on the left side of the footwell as you enter from the RV main door. A picture of the cover, which has been removed, is attached.

I'm working on the writeup on how to hook up the existing circuitry to add the boost feature. BTW, this feature IS being installed from the factory on the Dynamax Isata 3 - also now a FR product.
If you don't or didn't want to run the circuit (I did), you could just temporarily jump terminals "ES" and "coach" to close the isolator relay to start it from your coach batteries...you would need a second person or just a short wire with alligator clips.
__________________

__________________
2016 Forester 2401WS MBS
Life is short...eat the cookie
bob dirt is offline   Reply With Quote
Reply

Tags
diesel

Thread Tools
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




ForestRiverForums.com is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 02:31 PM.