Auxiliary battery options
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Senior User
Joined: Jan 2013
Posts: 177
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From: Spokane, Wa
Auxiliary battery options
I'm interested in installing an auxiliary battery in our Excursion. I've searched the forums here and it looks like there are a few options ranging from clean, functional and expensive to cheap and simple.
$375
Dirty Parts
$170
https://www.etrailer.com/Accessories...t/TLA7727.html
Is there a cheaper option? If not I may try to make the latter.
$375
Dirty Parts
$170
https://www.etrailer.com/Accessories...t/TLA7727.html
Is there a cheaper option? If not I may try to make the latter.
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Senior User
Joined: Jan 2013
Posts: 177
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From: Spokane, Wa
Yes and no. The "Carbon Charger" is where the diesel battery goes. It costs money to add a battery in that location.
Look at the pics in post -#1
https://www.ford-trucks.com/forums/1...-a-v-10-x.html
FTE Remembers
Joined: Apr 2011
Posts: 8,259
Likes: 346
From: Northern California
Find a 7.3 truck in a junk yard and harvest the parts.
Looks like about $20 worth of stuff from a pick-n-pull
Looks like about $20 worth of stuff from a pick-n-pull
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Posting Guru
Joined: May 2015
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We used to install these at the shop I worked at (as an upfitter). All we did was ground the second battery to the frame, and put in a LARGE solenoid to separate the power between the batteries when the ignition was off. It was stupid simple, and it works. If I recall correctly, that was the way our engineers (who worked with ford's engineers) recommended it done.
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Senior User
Joined: May 2010
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From: South Texas/RGV
No isolation in the diesels. They just sit in parallel. Upside is that it is a simple arrangement. Downside is that if one goes bad the second usually soon follows unless you catch it fast enough.
Why do you want the second battery? There can be different designs for the hookup depending on whether you want to just run accessories off the secondary when the engine is off versus wanting something to start the vehicle if the first battery is completely dead.
Laughing Gas
Joined: May 2006
Posts: 942
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From: Outside Boise, Idaho
As far as my suggestion was concerned it was only to address the additional battery in a factory location, easy squeezie. I was not even hinting at the isolation part of the installation, which is also not that difficult.
More Turbo
Joined: Dec 2012
Posts: 719
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From: WisCONsin
I was asking on isolation of circuits in factory psd set up
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Senior User
Joined: Jan 2013
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From: Spokane, Wa
One reason I'm leaning toward the solenoid is that I should be able to replace it easily and inexpensively.
Battery isolators seem to be complex and expensive. Knowing what battery to charge and when must take extra parts. With a solenoid I would just jump the solenoid like starting an old pickup right?
That was one idea I had, and probably the most frugal. I think I'd still have to move the carbon canister. Or delete it?
I want to have my cake and eat it too. I'm hoping for a frugal solution to have auxiliary power that doubles as a "Jump Start" battery.
Do you happen to recall what amp rating you needed? I think the V10 needs 700+ amps to start, but it wouldn't need that because the batteries would equalize?
Battery isolators seem to be complex and expensive. Knowing what battery to charge and when must take extra parts. With a solenoid I would just jump the solenoid like starting an old pickup right?
Do you happen to recall what amp rating you needed? I think the V10 needs 700+ amps to start, but it wouldn't need that because the batteries would equalize?
FTE Remembers
Joined: Apr 2011
Posts: 8,259
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From: Northern California
just move the carbon canister to the location that kit you linked to put it. All the bracket making material and fasteners you could ever need will be right at pick n pull when you go get the 7.3 parts. Plenty of ford vehicles with those starting solinoids if you want an isolator.
Senior User
Joined: May 2010
Posts: 351
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From: South Texas/RGV
Ah. Frugal. Simplest solution is to just wire a new battery in parallel with the old one. When one battery starts to go you can at least get the truck started to make it home. If you want to get fancier then add a relay so that the battery is only connected when the engine is running. Don't bother with a heavy duty solenoid and wiring. Just use your jumper cables in an emergency.
Elder User
Joined: Sep 2009
Posts: 514
Likes: 2
I've had this solenoid in my dual battery setup for about five years now, Trombetta 114-1211-020 DC Contactor
I have it wired to a switch on my dash so I can turn it on/off as needed.
I have it wired to a switch on my dash so I can turn it on/off as needed.
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