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I am not sure that I can help you with your second problem .
But for your starter problem, if you have someone to help you , have them turn the key to the start position , hold for a second and release for a second, and continue doing so while you go to the starter area with a test light . Ground the test light somewhere on engine and if you look at the smaller terminals (wires) on the starter, one of them is ground and the other should be the positive signal coming from the key switch being applied in the start position and then released by your assistant. Check with test light to see if there is power at that terminal or not . If you don't see power going on and off there, power is not coming from key switch to get starter to crank . If you don't see any wiring rubbed out or damaged anywhere , your ignition switch is probably gone soft and needs to be replaced . You can also test behind the key switch itself by using a test light again and trying to find a terminal behind the switch that powers up when the switch is at the start position. Good luck and if you need anything else, just message me? Thanks