Chsnge the alternator, anything that blows a 100 amp fuse is a definate direct short to ground. Check for a loose or broken connection
SOURCE: have charged the battery on my 1999mitsubishi mirage
remove all fuses,and relays,connect battery,install 100 amp fuse,if it blows,disconnect alternator,if it blows again,bad alternator no.2.check wire going to alt.for bare spot,or rubbing somewhere
SOURCE: I have a 2002 Mitsu Lancer , the Battery light
Make sure that is the correct amp fuse for that ,the alternator,also,check the large wire on the alternator,make sure it is not touching anything.
SOURCE: 100 amp fuse in engine
For the 100 main amp fuse to blow it has to be a alternator issue , ECM or dead short with the electrical part of the ignition switch.
If the alternator is replaced and still the fuse blows then check the actual electrical contacts of the ignition switch to see if they are shorted out.------
Check the wire between alternator B+ (large wire) and battery for problems.
check negative ground wires to chasis and motor.
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Also recheck all battery, starter alternator and ground wires and see , that no wire is connected in reverse order.------
Also try cleaning the 100 amp fuse socket with contact cleaner and then install the fuse and see , if it still blows.------Many a time fuse socket itself gets dirty and cause fuses to blow.------
Getting this possibilities checked should help.Thanks.Helpmech.
SOURCE: 20 amp fuse keeps blowing engine won't start, fuse
I am a mechanic,i had that same problem where my engine 20amp fuse were blowing....i fixed it...problem were a broken wire in the harnace on the side of the cylinder head....i made over $200 on that job...yahhh
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