My son’s 99 Taurus didn’t want to start. At first thought it was a dead battery because of something left on, but jumping it didn’t help. It starter was clicking like the solenoid was going out. Finally it did start and turned over fast like there wasn’t a problem. I shut it off and restarted it again, no problem. Tried it a 3rd time and it wouldn’t start again. Sometimes it clicked when I turned the key and sometimes it wouldn’t do anything. Finally I had the wife turn on the headlights and turn the key while I stood in front to see if the headlights dimmed. The first time she tried it, the headlights went completely out. Not just dim, but completely off. The car started just fine after that and has been starting just fine ever since.
Any ideas on why this is?