duel battery setup
Lead Driver
Joined: Jan 2003
Posts: 9,893
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From: Ohio
You can just wire it up in parallel for the most part. Make sure both batteries are in good shape if one is bad it will eat up the good one.
Maybe someone will chime if if that was an actual option? Camper special maybe? I would suppose if it was camper special then an isolater was installed so camper would only drain ONE battery, but allow alt. to charge both.
If you are only using it for starting then just wire in parallel. Why are you needing the second battery?
Maybe someone will chime if if that was an actual option? Camper special maybe? I would suppose if it was camper special then an isolater was installed so camper would only drain ONE battery, but allow alt. to charge both.
If you are only using it for starting then just wire in parallel. Why are you needing the second battery?
Junior User
Joined: May 2002
Posts: 58
Likes: 0
From: Orangevale, CA
My '72 F250 has dual batteries. Freightrain is right, mine is a Camper Special, and there is an isolator so the camper can't drain the truck battery, but will charge when driving. I don't have a wiring diagram, but I might be able to get some pics of the wiring if you need.
Last edited by 72 F250; Oct 15, 2007 at 05:19 PM.
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Freshman User
Joined: Sep 2007
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Thanks for the input. It is in fact a camper special/sport custom. there is what looks like an old cpu heat sink attached to the drivers fender well with wires hanging off(isolator?) i'm thinking of a second battery for camping. this is my first Ford and I'm having a hell of a time finding shop manuals or technical info for this year. any pics or direction would help greatly
Last edited by sssilvernblack; Oct 16, 2007 at 03:35 AM. Reason: forgot something
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
Welcome to FTE
There's NO such thing as a factory dual battery set up on any 1972 or earlier F100/350.
The 1964/72 Ford Truck Parts Catalog doesn't list any dual battery trays, clamps, wiring looms, relays, and there's no illustrations of a setup like this.
The factory dual battery set up was not offered till 1973.
1965/72 F100/250 Camper Specials came with a larger amp battery (70 amp: R-27F or 80 amp: R-27FA) and alternator.
If you have a dual battery set up, it was added by a previous owner. Camper dealers did this back then.
There's NO such thing as a factory dual battery set up on any 1972 or earlier F100/350.
The 1964/72 Ford Truck Parts Catalog doesn't list any dual battery trays, clamps, wiring looms, relays, and there's no illustrations of a setup like this.
The factory dual battery set up was not offered till 1973.
1965/72 F100/250 Camper Specials came with a larger amp battery (70 amp: R-27F or 80 amp: R-27FA) and alternator.
If you have a dual battery set up, it was added by a previous owner. Camper dealers did this back then.
Last edited by NumberDummy; Oct 16, 2007 at 04:01 AM.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
Originally Posted by sssilvernblack
Thanks for the input. It is in fact a camper special/sport custom. there is what looks like an old cpu heat sink attached to the drivers fender well with wires hanging off(isolator?) i'm thinking of a second battery for camping. this is my first Ford and I'm having a hell of a time finding shop manuals or technical info for this year. any pics or direction would help greatly
1964/72 Ford Truck Parts Catalog on CD: hipoparts.com
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Junior User
Joined: May 2002
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From: Orangevale, CA
Interesting. I thought this was a stock option. My Grandpa bought the truck new in '72, but he passed away in '81, so all I have for information about what was added to the truck, and what was stock is my dad's memory. He was only 12 back then though, so he's not too sure about some of the things.
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Post Fiend
Joined: Sep 2007
Posts: 6,221
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From: Cow Town, CA
If you are going to add a bat. i would make sure that they are close in CCAs and CAs are close, or atlest that is what i was told when i put 2 in my truck. and make sure you run them + to + and - to - other wise you will have a 24Volt system and most car elctronics dont run very well on 24V systems.
Fleet Mechanic
Joined: Aug 2007
Posts: 1,836
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From: Piney Woods of East Texas
If you have the isolater on the inner finder. You should have 1 terminal marked ALT, Bat1, & Bat2. Pretty self explanatory. I used the isolator for a wench I had on my bronco. Using it the batteries do not need to match. And if you loose your main battery you already have a battery to jump off of.
5th Wheeling
Joined: Sep 2007
Posts: 44
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From: Spanish Springs, Nevada
My F250 Camper Special has dual batteries also. I do not know how the thing is set up but my mechanic set it up so it wouldn't be a pain in the ***. One battery is to the starter and when it goes bad I can jump right from the second battery. I can e-mail photos of the set-up if you want.
If I wanted to change it I would go with a Perko switch which allows you to use 1, 2, 1 and 2 or switch it to off so no battery drain is possible. I had one on my boat with dual batteries and it worked great.
If I wanted to change it I would go with a Perko switch which allows you to use 1, 2, 1 and 2 or switch it to off so no battery drain is possible. I had one on my boat with dual batteries and it worked great.
