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Best way would be to attach at the relay with your new wire and ring terminal the starter solenoid will be 24 volt !

If you need a crank only signal then yes you can tap the purple/white wire its hot only when in crank position with the key! you should really do the doghead starter relay swap if you have not yet. save yourself a starter some time down the road ! [thumbzup]

You will never get power from both alternators one is for one battery and the other is for the second battery both alternates are only 12 volt the only thing that is 24 volt is the starter nothing else that is why the starter relay is there so the 12 volt switch can switch 24 volt to the starter...

I think I would run the cables along the frame under the truck then up to were you want the switch. if you run them threw the cab kind of hard to hide them going from front to back use rubber or covered straps to hold it and its out of the way and sight! 2cents