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Do a search on this site and there is a detailed thread on how to switch over to a HD solenoid instead of that light duty relay.
Also you are one of many that have put in a GR starter and now had relays burn out. Since doing the trick I have not had any problems.
Did you flatten the ears on the battery wire lug at the solenoid? It sounds like the purple wire from the relay is touching the battery wire lug.
Here is a diagram of your starting circuit.
http://www.ny-tactical.com/PDF-Files/StartingCircuit.pdf