Electrical problems/questions on my '73

My '73's electrical system is doing some unusual things that make me wonder what it's going to be like after I upgrade/replace things like the alternator (105 amp), headlight wiring (better), new MSA fusebox etc. When driving down the road with nothing on I periodically hear clicking in the passenger footwell making me wonder what's trying to operate. The wipers move, but only a little bit then seem to run out of "steam". The headlights will come on only when the switch is cycled 2-3 times. Is the clicking a result of the dealer installed A/C trying to cycle? (I thought I had it switched off)

Any recommendations would be appreciated, I'd like to get things more reliable before the weather begins to cool/become a factor.