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09-18-2020, 06:08 PM
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#1
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Senior Member
Join Date: Sep 2008
Posts: 401
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05 Workhorse 8.1 Alternator
Has anyone upgraded there alternator from 160 amps too 200 or more.
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Chuck
Just West Of The Pecos
05 Dolphin #5342
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09-19-2020, 07:39 AM
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#2
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Senior Member
Join Date: Oct 2002
Location: Madison, MS
Posts: 10,527
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The OE alternator was 145 Amps. Why do you need more?
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09-19-2020, 08:03 AM
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#3
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Senior Member
Join Date: Jul 2014
Posts: 35,446
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Wasn't an RV but I upgraded a 55 amp to a 250 amp alternator.
It was tough on the belts at full output and I needed to upgrade the positive and negetive wires to 2 gauge to get full output to the batteries.
Run to many amps thru a thinner wire and your just wasting the power heating the wire.
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09-19-2020, 08:32 AM
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#4
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Senior Member
Join Date: Sep 2008
Posts: 401
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I have been told that after installing 4 100AH lithium batteries the oem alternator would burn itself out trying to charge the 4 coach batteries and the chassis battery. Hence need to go from 145 amps to 250. Would rather not do that. I wonder if I can disconnect the coach batteries from the alternator and just let my solar system keep the chassis batteries charged?
__________________
Chuck
Just West Of The Pecos
05 Dolphin #5342
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09-19-2020, 08:56 AM
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#5
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Senior Member
Join Date: Jul 2014
Posts: 35,446
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Sure you can. Find the isolation/boost solenoid, by pressing the boost switch on and off while listening for it, and remove one of the small wires going to it.
With a wire off, the solenoid can't close and tie the batteries together.
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09-19-2020, 09:16 AM
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#6
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Senior Member
Join Date: Sep 2008
Posts: 401
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Thanks, twinboat. Appreciate it. Your advice has always been great.
Chuck
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Chuck
Just West Of The Pecos
05 Dolphin #5342
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09-19-2020, 09:26 AM
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#7
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Senior Member
Rexhall Owners Group
Join Date: Dec 2010
Location: L.A.
Posts: 412
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Quote:
Originally Posted by twinboat
Sure you can. Find the isolation/boost solenoid, by pressing the boost switch on and off while listening for it, and remove one of the small wires going to it.
With a wire off, the solenoid can't close and tie the batteries together.
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Is the solenoid part of the altrernator? If not, where is it located? I have the same engine and may want to do the same thing.
One solution I've seen is to reroute that wire to the dash and use a toggle switch to turn it on and off.
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GaryB1st
2005 Pace Arrow 35G
2016 Jeep Wrangler JKU Willys trim
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09-19-2020, 09:32 AM
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#8
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Senior Member
Join Date: Sep 2008
Posts: 401
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Mine is located in front right bay passenger side, top shelf. Has a decal marked coach battery.
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Chuck
Just West Of The Pecos
05 Dolphin #5342
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09-19-2020, 10:29 AM
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#9
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Senior Member
Join Date: Jul 2014
Posts: 35,446
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Quote:
Originally Posted by Chuck Q
Mine is located in front right bay passenger side, top shelf. Has a decal marked coach battery.
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It shouldn't be marked coach battery, that sounds like a battery disconnect solenoid.
Unless its marked coach on one side and chassis on the other.
Your looking for a solenoid that has battery size cables on both sides. One from coach and one chassis battery.
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09-21-2020, 11:41 PM
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#10
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Senior Member
Join Date: Mar 2017
Posts: 260
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Is the boost solenoid energized when the key is on? I thought that was the purpose of the safety boost switch to connect the house batteries to the chassis battery?
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2007 Fleetwood Terra LX
Workhorse W22 8.1 Allison
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09-22-2020, 06:45 AM
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#11
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Senior Member
Join Date: Aug 2017
Posts: 2,106
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Quote:
Originally Posted by garyre
Is the boost solenoid energized when the key is on? I thought that was the purpose of the safety boost switch to connect the house batteries to the chassis battery?
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The boost solenoid will be energized when the engine is running and after the chassis batteries reach their charged voltage determined by the battery management system.
If it was energized when the key is turned on , your chassis battery could be run down if the house batteries are dead.
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1993 Tiffin Allegro Bay 32'
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09-26-2020, 07:02 AM
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#12
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Junior Member
Workhorse Chassis Owner
Join Date: Jul 2013
Location: Up State NY
Posts: 3
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Hi all, I am currently installing a lithium iron phosphate house battery and I'm interested in the signal from the engine that turns this solenoid on. I think by disconnecting the signal wire I can safely charge my house battery without overtaxing my alternator. I plan on using a dc-to-dc charger for the house batteries and having them not directly connected to the alternator. I have a 2011 Workhorse Winnebago Adventurer 37f and cannot find anything in the wiring diagrams to help me.
Thanks in advance for any help.
Bill
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2011 Winnebago Adventurer 37F
On 2009 Workhorse W24
Roumer is it was the last Workhorse off the assembly line at Winnebago
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