Its the 175amp megafuse. About $7 at the auto parts store
Check the battery ground connection is properly attached to the chassis,
Check the alternator is properly grounded to the motor and chassis,
Check battery terminal voltage is approx 14.0 - 14.5V when the motor is running with the headlights or other load switched on.
Check the "IND" alternator excitation terminal has +12V applied when ignition 'on' (motor not running).
(For the battery to go flat in 20mins, there must be a considerable load on the battery and the alternator must not be charging).
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