95 montero transmission shift problems + overheating + battery not charging

the voltage should remain at 14.5 volts at all engine speeds above idle 13.9 volts at idle indicates that the alternator is charging but not at set voltage
head lights are the biggest drain that affects charge rate rate and it it maintains and from you description that is not a problem
when you select a gear it indicates a heavy drain which is a high resistance or a dead short in that circuit that is taking out more power than the alternator is charging
There there is nothing in the gear selection that draws such power
the other thing is that when selection a gear the engine rpm is tool low and the alternator stops charging
for auto vehicles , the idle rpm should be at 800-900 rpm dropping to 750-800 in drive

P0740 torque converter malfunction
Possible causes
Low or dirty transmission fluid
Faulty torque converter clutch solenoid valve
Torque converter clutch solenoid valve harness is open or shorted
Torque converter clutch solenoid valve circuit poor electrical connection

P0562 charging system voltage low
Possible causes
Low battery charge
Defective battery
Faulty alternator
Problem with belt
Open or shorted system voltage circuit

Once voltage drops below 9 volts, many things will stop working. After voltage drops below 8 volts, most likely everything will shut down. If you have a low voltage condition, you need to have the battery/alternator charging system checked for problems. Once you get the voltage issue fixed, most likely all the other issues will disappear.

like I see the problem ,the most common is belt not tight enough or alternator or battery
with a voltmeter check the battery voltage more then 13 volts. test battery with a load test

Ck your alternator output, should be between 13.8 and 14.2 volts, A bad alt will cause the battery to discharge when driving, Once voltage drops to a certain level (9.8 I think ) the ecm starts to shut down causing all kinds of strange problems, like running bad ,trans not shifting right, even the radio ! It happened to me in my 95 chev p/u

If you only have 5 volts you may have a bad battery or alternator. Or maybe a B+ (battery positive) wire short to ground. Check voltage engine running at the battery then alternator +. If your voltage is that low your TCM won't work.

try unhooking battery for a few minutes and hooking back up. this probably wont help but is free to try. sounds like you have a shift solenoid problem and do not need a whole transmission,check the electrical connections at trans make sure something is not loose. Try and find a trans tech that is knowledgable in repairs and not just replacement

the squeal when you start is the drive belt, it is slipping on the alternate you have to remember that the starter is the largest load on the battery so when the engine starts the alternator goes into a full output mode so there is a lot of load on the alternator belt right after start up also this probably why you are having a low charge at idle the belt is slipping enough to allow the alternator to slip at low ingoing speeds, take a good look at the belt tensionor and the drive belt best guess is that you will need both a new belt and a new tensionor.......HAVE FUN

Definition of Diagnostic Trouble Code P1714 Chrysler: Low Battery Voltage Dodge: Low Battery Voltage Ford: Shift Solenoid A Inductive Signature Jaguar: Shift solenoid A inductive signature malfunction Jeep: Low Battery Voltage Lincoln: Shift Solenoid A Inductive Signature Mazda: Shift Solenoid '1' Mechanical Fault Mercury: Shift Solenoid A Inductive Signature Subaru: Throttle position sensor power circuit for automatic transmission
Definition of Diagnostic Trouble Code P1714 Chrysler: Low Battery Voltage Dodge: Low Battery Voltage Ford: Shift Solenoid A Inductive Signature Jaguar: Shift solenoid A inductive signature malfunction Jeep: Low Battery Voltage Lincoln: Shift Solenoid A Inductive Signature Mazda: Shift Solenoid '1' Mechanical Fault Mercury: Shift Solenoid A Inductive Signature Subaru: Throttle position sensor power circuit for automatic transmission
Definition of Diagnostic Trouble Code P1714 Chrysler: Low Battery Voltage Dodge: Low Battery Voltage Ford: Shift Solenoid A Inductive Signature Jaguar: Shift solenoid A inductive signature malfunction Jeep: Low Battery Voltage Lincoln: Shift Solenoid A Inductive Signature Mazda: Shift Solenoid '1' Mechanical Fault Mercury: Shift Solenoid A Inductive Signature Subaru: Throttle position sensor power circuit for automatic transmission
That code is low battery voltage on a chrysler

You just go to the link I attached I'm sure you will get the solution of your problem
MITSUBISHI MONTERO SPORT SERVICE REPAIR MANUAL 1999 2000 2001 2002 DOWNLOAD