Went down to the hardware store, came back out , turned the key, nothing. got dash gauges,dings when the key is on , lights. Turning the key to start nothing changes, no dimming, no clicks. Got it towed home. Figured it was the ignition switch , changed out the electrical unit. Nothing changed. Good batteries , clean and tight cables, could the starter just stop working????? but there is no draw on the system when the key is turned to start. Where to look next?