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about 600 amps
most likely a failing starter
The armature bushings inside the starter motor are probably shot. Time to replace the starter.
Nothing at all. Increasing the cranking amps will not harm anything. The starter will only draw the amps it needs.
decribe two causes of higher than normal starter current draw
Any time your overheat the starter motor by overcranking without enough cooling time you can damage the starter. If you let it cool good and it's still not right you will need to do an amp draw test on it to see if it's in range. Good luck
Amperage draw, excessive amperage draw, and or dirty & loose connections. This should be checked out if the temperature is elevated when not cranking your engine.
Remove starter and bench test it for operation and current draw
Starter relay protects the ignition switch from excessive electrical draw.
Starters can overheat because they are cranking for too long - It takes an enormous amount of amperage which = power and heat, to crank over some of the older motors- Or, the engine is stuck and the starter is trying to draw more amperage, which, creates heat, to turn it over. 10 seconds of cranking at a time is recommended with a few seconds for cooldown. If your engine won't start in that amount of time, you probably have an air/fuel delivery issue, or a weak battery that cannot turn the engine fast enough, or a bad ignition system.
25amps
Jason