Hello. We have an 03 Mitsubishi Galant. We need to identify the fusable link at battery positive cable. Please identify its uses and replacement. Thanks DC

This video may help ... the sensor is underneath the timing belt cover so it is a bit involved to get to ....
https://www.youtube.com/watch?v=RHMe3S7RQ68

Hello, crank position sensor located at the 2 o`clock position hidden behind timing cover and crank shaft pulley. If you look closely in well lit area or use a flashlight you can follow the (CCPS) harness down the right hand side of timing cover to where it goes into lower timing cover on lower right hand side of crank shaft pulley. It can be replaced with out removing timing belt. Please note if the 60,000 miles heavy service interval for timing belt is needed and water pump condition should be observed when repairing the crank position sensor.

By won't turn over, do you mean it cranks over but won't start, or it won't even crank? If the starter is cranking the engine, check the fuel pressure or verify the pump is working. Just turning the key to on, not start, should turn the pump on for a couple of seconds, to put fuel in the line and up to the engine. If you have fuel pressure, check for spark. If you have spark, check the fuel injector circuit.

If the engine won't crank, you need to check the state of your battery, it should be 12.6 volts to be fully charged. If it is good, check both battery cables for clean, tight connections, check for a good ground connection, and the positive cable that attaches to the starter-make sure that connection is tight. If still no crank, take the starter off to be tested.

I think you should buy repair manual first for your vehicle after that it will be easy for you to solve the problem. Check the link may be you will get something useful here Complete 2001 Mitsubishi Galant Workshop Repair Service Manual

Do not disconnect the positive Or negative cable while vehicle is running it is no longer an acceptable test and damage to computers could occur as there is no ability to suppress or absorb a voltage spike. If you remove the negative cable to check for an amperage draw that's an other thing. You should use a meter and connect it in series between the neg post and the neg cable once all modules are in sleep mode there should be no more than .3v as a rule of thumb. If more you have a parasitic draw which you could isolate the system/circuit by removing fuses one at a time. When the draw is gone that's the circuit in question.

There are fusable links that are inline to the battery positive cable. Make sure you have good connections or an open connection in the feed wire. It may have been broken upon installation. Question.,.did you install the negative cable first before the positive cable? If so it can short out a fusable link

clean all corrosion off, use baking soda and water and tooth brush, tighten then loosen fasteners slowly to remove use silicone lubricant, 

never replace a cable like that without the inline fuse. that will protect the system in case of a short..... BE SAFE.

For starting the engine you need :compression,petrol,ignition.

Check your battery cables. You might have a fuseable link in one of the cables.