"hosed dust off (carefully)"
With water? And where?
"Speedometer not working
Cruise control (aftermarket) not working
Airconditioner not working (although fan runs)"
Could be the battery and/or alternator dying.
Battery test. Engine off, lights on for one minute, should be 12 to 12.5 volts across battery terminals.
Alternator test. Engine running, should be 14 to 14.5 volts across the battery terminals.
"Cable come loose?"
Maybe. Check the wiring from battery to alternator and battery to ground to make sure there is no short.
When the battery is almost dead, it does funny things to the electricals, wipers coming on, hazard lights coming on, instrument panel lights coming on,.... you get the picture.
