I know electrical issues can be a bear to locate so I thought I'd present this to the folks here - in case someone else had a similar issue so as to help narrow it down a bit before I send it to a shop for analysis. Thanks, all!
My '68 GT500 was recently put back in running condition - after many years of storage; so it's probably still in the 'working out the bugs' stage. Although the battery was less than a year old, I just discovered it had totally died. I bought a new battery and when we went to connect it, it sparked a lot more than usual, then heard a ticking sound (no key in the ignition yet). We put on the headlights - and them, and the interior dash lights - were flickering, in unison with the ticking sound. My friend pulled some of the fuses out; no change. The ticking appears to be coming from the dash - driver's side. Any thoughts as to where we should focus our efforts first would be greatly appreciated! (the battery is now disconnected on a trickle charger, since I presume whatever the cause of the ticking is what may have caused the last battery to die prematurely - I did not hear it prior to connecting the new battery, though, but it is possible I wasn't listening for anything - thanks, again!)