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Trucker12 · 09-22-2011, 08:00 PM

I put a 40 amp J-case fuse in the fuse box where the red plastic dummy fuse was located. That supplied power to the red wire in the trailer plug. There is power at the plug with the truck running and when the truck is turned off. This indicates to me that the truck battery is not isolated from the camper battery. So now I need to find a wire that is only hot when the truck ignition switch is on. I need that to wire up the battery isolator. Anyone know of an easy wire I can tap into for 12 volts when the ignition is turned on and dead when the ignition is off?

09-22-2011, 08:00 PM	#5
Trucker12 Registered User Join Date: Sep 2011 Location: Catawissa Posts: 3	Re: Battery Isolation questions I put a 40 amp J-case fuse in the fuse box where the red plastic dummy fuse was located. That supplied power to the red wire in the trailer plug. There is power at the plug with the truck running and when the truck is turned off. This indicates to me that the truck battery is not isolated from the camper battery. So now I need to find a wire that is only hot when the truck ignition switch is on. I need that to wire up the battery isolator. Anyone know of an easy wire I can tap into for 12 volts when the ignition is turned on and dead when the ignition is off?