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Dual battery TP2 and Stud 1 Fuse 68 question
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Question
intheburbs
I've been reading up on the fuse in question, and it's brought me to a question that I'm hoping to get an answer on.
I've seen this:
"If a fuse is installed in this position, the accessories will discharge the primary battery in addition to the auxiliary battery."
So, the auxiliary battery will power trailer accessories, and the primary battery powers vehicle accessories? One of the main reasons I installed a second battery is to prevent battery rundown, and to make sure I'm able to start the truck after hours or days. I was under the (mistaken?) impression that the aux battery is isolated when the ignition is off.
Here's my question: If I'm boondocking with my travel trailer in the middle of nowhere, is the trailer draining the aux battery? Do I need to disconnect the trailer plug to make sure the aux battery is completely isolated?
Or should I remove the inline 40-amp fuse in the wire that goes from the aux positive post to stud 1 in front of the load center?
If this is the case, it kind of seems silly, as it negates one of the benefits to having an aux battery.
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