Wiring diagrams

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Feb 4, 2018 | 05:23 PM

1970sandabove

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From: Federal way

Wiring diagrams

I need some help finding a wiring diagram or someone who knows why my 1977 f250 has 2 batteries that do not seem to be connected to eachother at all.

Feb 4, 2018 | 10:03 PM

march

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Joined: May 2006

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From: Port Orchard Wa

77 is missing, but the other years should be similar.

1973-1979 Ford Truck Wiring Diagrams & Schematics - FORDification.net

Feb 5, 2018 | 12:22 AM

77&79F250

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From: S/W Missouri, Polk county

1st off you should figure out if the truck came FACTORY with them or where they PO added. is the truck a Camper Special, does the build sheet show duel batteries?

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Feb 5, 2018 | 10:24 AM

Viger81

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I have same year f250 and there is a wire that runs across the front that connects the two batteries. Not sure if stock though. I havent messed around much with mine. Not until the weather clears up a bot amd i can get some room on my garage.

Feb 5, 2018 | 11:11 AM

JakeHan

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Joined: Jun 2005

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If it's factory, it's basically an isolated system to power your camper without running you starting battery dead, and will then charge back up when the vehicle is running. Not really necessary unless you have a mounted camper, but can be handy for certain scenarios. They can be wired to the "hot" pin of your trailer plug, so it piggybacks with a camp-trailer battery. Most of 'em I've seen are either unhooked or re-wired parallel with the starting battery.

Feb 6, 2018 | 01:43 AM

1970sandabove

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From: Federal way

Quote:

Originally Posted by 77&79F250

1st off you should figure out if the truck came FACTORY with them or where they PO added. is the truck a Camper Special, does the build sheet show duel batteries?

I managed to figure out that they are factory, and yes is is a camper special. Truck even comes with a sunroof

Feb 7, 2018 | 07:22 PM

Bulldog187th

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From: Southern Oregon

I wish I had seen this. I have the same truck sunroof and all. I just ripped out the whole wiring harness or I could have taken pictures of how it was all hooked up with the two batteries.

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Feb 8, 2018 | 03:30 PM

Bulldog187th

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From: Southern Oregon

here is the 77 one .

Feb 24, 2018 | 09:32 AM

#10

black & blue 78/9

Laughing Gas

Joined: Mar 2016

Posts: 757

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From: Cheyenne, Wy

Could I take the duel battery setup from a 90s diesel and put it in my dents? Any "special" piece that I HAVE to be sure to grab to make the swap easier? TIA