There is a major electrical fault that keeps blowing the fuse. The fuse protects that part of the electrical circuit, 40 amps is heavy electrical circuit, it it wasn't protected by a fuse it car could catch on fire.
You need to get an auto electrician or your Mitsubishi service center to locate the fault and repair.
If you had a wiring diagram for your car then you can trace the wiring from the 40A fuse to the various components to locate the wiring fault or component fault.
SOURCE: 30 amp ignition fuse in engine compartment blows at start
It sounds like a bad ignition switch or something is grounding out.Try to isolate the problem to key positions.See if the fuse blows when you turn the key to ACC(when your dash lights come on without starting)If the fuse does not blow then when you go to start it and it blows it could be one of many problems,the more common ones could be ignition switch,wiring,starter relay,starter soleniod,or perhaps the starter itself is shorting out,this can sometimes happen when a starter goes bad.
SOURCE: 2003 mitsubishi lancer will continue to die out
It sounds like you have a bad ground or short somewhere
you will need to get it to a good mechanic thats good with electrical troubleshooting
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c
SOURCE: ignition fuse keeps blowing when i turn the key
It MUST be the starter relay coil - or the power wire that feeds it. Likely a short in the relay coil (AKA starter selenoid).
SOURCE: Keeps blowing starter fuse when you turn the key to start engine.
YOU GOT A IGNITION WIRE TO STARTER SHORTING TO GROUND.
SOURCE: 2004 chrysler sebring GTC convertible,
Your starter is drawing too much current. Recommend you replace the starter. Perhaps you can do it yourself using my tips at http://www.fixya.com/cars/r5973094-starter_replace.
Please reply if you have more questions.
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