Been driving my son's 99 Cherokee while he's at boot camp. Sometimes, not all the time, when I turn on the left turn signal, the lights on all four corners flash (like I had my emergency flashers on). Only the left turn arrow on the dash flashes. I only know it does this because other people who were following me have told me. I mentioned this to a friend with a Cherokee and he says his does this too. Anyone had this problem? Anyone know how to fix it? Thanks.