Using 12V while hooked up to the tow vehicle
We have a new Viking 17BH. Only used twice so far. It's been in storage since our Michigan trip in July. The battery has been on a trickle charger. When I went to install the battery to winterize, ...
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For what it's worth info may have nothing to do with your situation - there is normaly a ciruit breaker of fuse breaker on the battery main line feed and and if it goes all the feed from the TT battery is lost. Some can be reset others need to be replaced. Only about $10, available at any Auto Parts Store. Normally located on frame near the battery case. If this thing trips or blows and your not on shore power (not sure about what would work if connected to the truck) you will have no 12 V power in TT. Easy to change.
