I have a 2002 Mitsu Lancer , the Battery light & Handbrake started to Lit. I have checked the Fuse under the hood and found out the 7.5 amp fuse is blown, so i replaced the 7.5 fuse & keeps blowing. I checked with AutoZone and they said my Alternator (w/ Internal Regulator or Diode) is Overcharging to 15 volts , so i have the Alternator replaced but it still keeps blowing that 7.5 fuse, what is wrong can someone help ...

The engine doesn't spin when you turn the key to start ? No click -no nothing . Check the starter relay in the under hood fuse / relay box . Security light lit on the instrument cluster ? Do you know what a relay is ? videos on youtube . How to voltage drop test starter motor circuit

In the under hood fuse box ,HORN fuse #8 15 amp ,if you find good check horn relay #37 in under hood fuse box . I would like to asks ,do you have an air bag light lit on the dash ?

fuse for heater is 30 amp and a 10 amp relay found behind a small removable panel in dash and also there is a 10 amp a/c fuse in fuse box under hood of car

The fuse box is beside the battery under the hood. The fuses and what they relate to is marked under the lid of that fuse box. Use same size fuse if it needs replacing. If in doubt check all the 15 to 30 amp fuses.

Here's the link and I'm sure you will get the solution of your problem
Lancer

eather under the hood, same side of ur car battery just a little above, its big plastic thing pull that off should be marked on plastic which is flasher fuse or check inside just a little left below ur steering wheel

[email protected] all the fuses and relays in the 2 boxes under the hood and another one of fuses and relays panel inside the car, front of the driver seat, behind the pull out box next to the hood release handle..Under the hood check inside the one with 8" black square box;Check # 1 slot fuse, it is 60 amps for (+B ), check # 8 slot fuse for Engine control 20 amps, check # 15 slot Fuel pump 15 amps..And check another skinny black box lie next to that box, it has relay F, that is Engine control, check that also...And inside the car fuses panel; Check # 1 slot fuse 10 amps that for Ignition coil, # 8 slot Engine control 7.5 amps, # 12 slot Engine control 7.5 amps..After that recheck the battery post, that maybe needed re-tight..Don't force to tight too much, that will crack and broke the post and the plastic battery body...And check all the ignition wires and spark plugs that are tight or needed to replace..And check all the vacuum lines that are loose and leaks suctions or sometimes they are crack open by long ages..By the way check and recheck all those other fuses and relay for make sure they are good...Believe me that not hard to figure out those problems..You did everything rights so far..That one 100 amps fuse at the + battery post cable was connect to alternator for recharging your battery and give power to other items when car was running..Below that post, the middle cable was connect to the starter motor and the bottom cable was connect to that 8" black fuses and relays box under the hood...

START THE VEHICLE, PUT A VOLTMETER ON THE BATTERY. THE VOLTAGE SHOULD READ 13.90 TO 14.80. IF THAT IS OK, THERE MAY BE A BATTERY DRAIN. TURN OFF EVERY SWITCH IN THE CAR.CLOSE ALL THE DOORS. MAKE SURE ALL THE COURTESY LIGHTS ARE GOING OUT. & THE GLOVE COMPARTMENT LIGHT. RAISE THE HOOD. DISABLE ANY UNDER HOOD LIGHTS. DISCONNECT THE NEG. CABLE FROM THE BATTERY. PUT A 12 VOLT TEST LIGHT, ONE END ON THE NEG BATTERY POST & THE OTHER END ON A GOOD GROUND { METAL }. IF THE LIGHT COMES ON THERE IS A BATTERY DRAIN. NO LIGHT , NO DRAIN. IF IT'S ON, ONE AT A TIME PULL THE FUSES OUT OF THE POWER DISTRIBUTION BOX. IF THE LIGHT STAYS LIT, PUT THE FUSE BACK. DO THIS WITH ALL THE FUSES BIG & SMALL. IF THE LIGHT STAYS LIT, DISCONNECT THE ALTERNATOR. THEY CAN CHARGE THE BATTERY WHILE RUNNING, & DRAIN WHEN STOPPED.

Are the bulbs good? And i highly doubt your ecu has taken a ****. Check the wires going in are they tight in their connector or are they loose ?

its normally a 10 amp fuse found under the hood or inside under the dashboard