I have a 1997 Mitsubishi Montero Sport. My car battery died the other day I charged the battery in the car and it ran for while, I turned it off but when I went to crank it would not start. I replaced the battery and alternator and now my inside lights will not turn on and the SRS indication light won't leave the dash and I have a slow take off. My car is straining to take off and I can see my light flicker. What could be the problem? ???

Question edited for clarity.

Seems to be a known issue.

https://www.google.com/search?q=2001+Mitsubishi+Montero+Sport+LS.+The+alternator+is+good+but+not+charging+battery

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reset the ecm program to ensure that the alternator regulation is not ECM controlled
Have an accredited auto electrician do a bench test of the alternator

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Is the charging rate at 14.7 volts engine running?

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IF THE FREON IS LOW THE AC CLUTCH WILL NOT KICK IN, MAKE SUE YOU HAVE FREON ON THE SYSTEM , WHEN LOADING FREON USE THE LOW SIDE VALVE

disconnect the battery again, with it disconnected press hold the brake pedal for 30 seconds, leave the battery disconnected for 30 minutes. reconnect battery, turn key from off to on and wait 2 minutes, start the vehicle (don't touch the gas or brake for 5 minutes) this is what I did on my friends montero and it started right up and ran fine, only thing I could figure is that I caused the computer to reset and recalibrate itself, but i'm not real sure. worked for him maybe it will work for you... good luck

you may have a fused relay check boss bar in engine cmpartment, check relays and plugs for corrosion or burnt contacts

sit with foot on gas at steady 3000 rpm, then turn on all your lights, hazard warning lights, heater, and window defrost, if the power drops , then you need a new battery....sometimes the battery power can control the engine idle, the alternator is only for charging the battery, not for running the cars electrics, this is the battery's job

did you checked yoour battery cables ? you must also check your computer and fuse box to make sure that they are seald well and not letting water to enter

I had the same problem when I did battery maintenance on my 1988 Montero Sport. The problem was explained to me, that the car's electronic pollution control computer data was erased when the battery is disconnected or the battery totally discharges. The car's computer uses this data to regulate idle speed and other engine factors. The solution given to me was to recheck the battery connections (make sure they are clean, and tighten down), start the vehicle, and just let it sit and idle for about 15 - 20 minutes (without racing the engine or driving the vehicle). This will rebuild and repopulate the car's computer engine data it needs to make adjustments. Hope this helps.
Mark.