[Oak]

The owners manual says it only has one fuse but the schematic shows 2. The manual says it should be a 20 amp slow blow.

Looking at the pic of my 1872 (same tractor) I only see one fuse in the dash tower.

I would look real close at your headlight wiring for any shorted wires. This can be a problem area on the 82 series.

If no issues are found there I would do as other say and use a continuity meter and check for a short circuit.

I would remove the + terminal cable on the battery and place one lead on the cable you just removed, make sure your fuse is good and place the other lead of the meter on the battery negitave terminal. If your meter has a beeper I would turn that on. Now, turn the key to the "lights on position" and see if your meter is beeping. You will read resistance of you lights in this position but if it is 0 you have a short. Turn the key to the run position and start moving wires around and see if your meter starts beeping showing that you have a short.

Good luck and let us know what you find.