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There is only one fuse on a deuce.

One more thought, look over all of your positive cables. Look very closely for a short to ground. A large intermittent load could cause spikes that would blow bulbs. Known bad spots are near the turbo, under the edge of the cab,and the hole in the frame near the battery box.

Do you idle a lot? Vibration will kill them. The headlight mount rubber isolators get hard with age. I know we've posted replacement choices. Turning up your idle a little helps too. Watch your steering wheel and adjust untill it stops vibrating. Be sure your grounds are clean.