Intermittent electricl power loss.

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The car would occasionally stall out at slow speeds or at a stop sign and if you turned on the radio, heater /AC F and wipers on high speed everything would slow down and the lights would dim. I took it to Simmons Rockwell for maintenance and all they could do is hook it up and test the battery and Alternator for a $75 charge and tell me that every thing was good. I continually would loose all power to the car. I replaced the Alternator and engine ground which was severely corroded. This helped the power draw problem but did not fix completely. I finally started manually tracing the wires and every thing was looking good until I removed the fuse box and found the connector on the back was not fully seated and was loose. After reseating the connector all problems disappeared.