Upon arrival found system not coming on, checked inside air handler and found that the low voltage fuse was blown, replaced fuse and tested systems heat. System came on. Tested systems cooling and fuse blew. Found low voltage wire going to outdoor unit bear in some spots and it was grounding out to the metal skirt on side of home. Replaced section of wire and tested systems cooling. Contactor closed in and fuse did not blow. System is now operating properly at this time.