On my 1981 4x4 Toyota pickup, the Charge light comes on intermittently, stays on for about a minute, then will go off. Sometimes it won't come on for days, other times it comes back on within a minute. I can hear a "click" coming from under the glove box, so I assume there is a relay there. Volt Meter says it's putting out 14v - everything appears okay except for the light. Do I have a bad relay? Any ideas where else to look? Thanks.