Try isolating the circuit by: 1) connecting ammeter & measuring drain. 2) pull a fuse until you find a fuse that reduces the drain. 3.) Disconnect load items on that particular circuit.

Confirm accuracy of gauge before you travel far along this path.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.