1998 Plymouth Breeze blowing 20 amp fuse when starting car

Car has a 1 year old battery.
Car has a used computer chip.

Pep-Boys had tar towed to dealearship for reprogramming.
Computer chip was reprogrammed

Alternator was tested and tested fine.
-Car ran to Ohio, Parked over night and was placed on a Marine charger overnight.
(known to have problem while driving, battery light comes on.)

Sunday Attempted to start car,
Car would do nothing when the key was turned.
battery semed dead (indicator on charger said Full Charge)

Jumped car with another car car started instantly.

Let Car run for 30 Seconds

Turned off.

PLaced back on charger

Charger indicated battery was not fully charged.

15 minutes later, battery charger indicated full charge.

Charger disconnected, car started instantly.
1/2 Hour went to start car
Car Attempted to start, stalled
Turned key off then on, car would do nothing when the key was turned.
battery semed dead
discovered that the 20 amp fuse had blown repalce fuse when starte first time started up imeaditly
when tried a second fuse blew.
repeated thseveral times same story new fuse starts first time fuse blows on second start.