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Do you know anything about automotive electrical ? How to follow a wiring diagram ? Basic electrical testing ? Using a DVOM - digital volt ohm meter etc.... You could go to http://bbbind.com/free_tsb.html free wiring diagrams ! Enter your vehicle info ,year ,make , model an engine size . Then under system click on electrical distribution ,then under subsystem click on power distribution . It will show 2 diagrams found . Click on the search button an two blue links will pop up .Click on the first one scroll down to last diagram . This is a diagram of ignition switch an power feeds ! Check the two yellow wires for B+ voltage . No power there would mean one of the fusible links blew . Scroll back to the top diagram ,the fusible links are shown at the top left .They hookup at the starter solenoid > There are videos on youtube showing basic electrical testing , how to read a wiring diagram , how to use a DVOM . This is how you have to find the problem ,testing !
In most newer cars the starter fuse is a fusible link or in a fuse panel under the hood. Fusible links are often difficult to find because they look like a barely noticeable bump in the wire. The starter relay/solenoid is typically an assembly that is part of the starter motor.
A fusible link is a special wire that acts like a fuse - burning in two if the amperage load on the circuit is too high. It is not likely the wire would work sometimes and not others. Someone would need to check to see if the starter has battery power and power from the key which goes thru the neutral safety switch. I'd have to see it to know what was changed.
There are fusible link wires on feed to alternator & starter solenoid. Check for power to each right where they attach to respective units. If no power trace down wire usually within a foot of connector. If you have power there, you will need to cut out burned out fusible link wire & reattach a new section.
The wires and the fusible links at the starter should be checked, and you will know a bad fusible link wire when you find one, because they will stretch like a rubber-band, and repair any fusible link wire that you find that are burned out.
If you can not find any problem with the wiring or fusible links at the starter, then check the "start" fuse for the starter field wire, (if it has one it will usually be located out in the fuse/relay junction box) also the starter field wire should be connected to the "S" terminal on the starter solenoid and it will be "hot" or have power to it only when the key is in the "start" position, and if the field wire to the starter is the wire that burned up then the ignition switch itself might have been damaged.
Look for a blown fuse,or fusible links to be burned out,these fusible links will bolt onto the starter with the positive cable,I do not know what year it is,but if it is a newer model,there is a fuse on the rail,on passengers side,near the radiator,it will be a flat fuse with two mounting bolts on each side of it,150 amp,or 200 amp,or lower,disconnect the battery before replacing it.
if just the starter fusible link is burned then you should have power to and from the switch, and also power before but not after the fusible link itself. if this is the case you may actually have a bad starter. fusible links burn out for a reason. of course, you'd have to replace the burned fusible link as well.
I believe the starter is coming to the end of its life.
It would keep drawing more and more amps to keep it turning the more it wears out.
I would take the starter out, take it to the autoparts store for testing.