Battery is under the back seat on the passenger side (left). The seat has a squeese lever under each anterior corner, where it meets the base. Simply push up on the lever on one side and it will release, then do the other and seat is loose. Battery is (should be) covered with a soft insulation and plastic sheet.
There is a glow plug relay on the front drivers side wheel well. Not sure about any fuse, but doubt it. Good luck. Harvey

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hlg