I have a 2010 tracker pro 170 tx with a mercury 50 2 stroke. I attempted to start it this year and noticed ignition switch was warped and cracked and would not start. I ordered a new switch and now it seems to ground out the motor when key is turned on (no spark)! When I remove the kill switch wire on the engine it will start with ignition switch but will not shut off with switch. The batteries are new and the kill safety switch tests good! Any ideas on what I'm missing? Any thoughts appreciated. Thanks.