Don't know how well you will see it from the picture. No cooling, outdoor unit not coming on. I pull the disconnect, spin the fan, and get the electrical panel ready to access. Go back inside and call for cool, return to unit and put disconnect back in. *POP* Ruh Roh.
Pull it back out quickly and start looking around underneath the ground cover to discover a previous electrical repair to conduit could not hold up to a roofer, cable guy or whoever stepped on it. Bare wire end poking up at me - don't know whether it was the ground or one of the legs. Upon questioning the tenant, she offered that fuses have blown in the past and she even got a shock once when pulling weeds in the vicinity of the unit.
The serial number for this Carrier was so old it was before the current pattern of week and year manufacutred in the first four digits. The only numbers that made sense were either 87 or 77 for the year. As I have never come across a unit with an electrical panel even remotely like this one (screwed to the back of a hinged door kind of contraption), I believe it just might be from '77. Which would make it the oldest AC I've ever seen still pressed for service.