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Search took 0.00 seconds. Search: Posts Made By: dhally
Forum: Electrical and Electronics 07-20-2015, 02:14 PM
Replies: 99
Views: 89,026
Posted By dhally
Re: Ford Dual Battery Setup

From my recollection, there is a circuit from the aux battery to power a trailer even when the ignition is off. And the aux battery is disconnected when the engine is off. The relay and fuse are...
Forum: Electrical and Electronics 06-08-2011, 12:16 PM
Replies: 99
Views: 89,026
Posted By dhally
Re: Ford Dual Battery Setup

Wow! that is exactly the information I was looking for. I just ordered a factory wiring diagram. I'm trying to see if I can use the aux battery, possibly with the addition of a second one.

Can...
Forum: Electrical and Electronics 06-03-2011, 03:41 PM
Replies: 99
Views: 89,026
Posted By dhally
Re: Ford Dual Battery Setup

I did a little more research and it appears that the relay, wiring, and fuse are rated 40A (continuous). That should be more than adequate to run the house system. The only problem is the Group 65...
Forum: Electrical and Electronics 06-02-2011, 11:15 PM
Replies: 99
Views: 89,026
Posted By dhally
Re: Ford Dual Battery Setup

I don't have the trailer wiring, but can test it at the batteries. It sounds like the system is designed to allow discharging the aux battery alone. If this is true, the factory relay and wiring...
Forum: Electrical and Electronics 06-02-2011, 10:12 PM
Replies: 99
Views: 89,026
Posted By dhally
Re: Ford Dual Battery Setup

I just found out that my 2009 E250 5.4L has an aux battery mounted on the frame rail under the side door. In the owner's manual it states that the aux battery (if equipped) is NOT used for starting...
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