2004 silverado factory deck

Ask him to find out how much that factory head unit is worth from GM and then ask him if he still wants to keep it? My bet is that when he finds out it is worth over $300.00 he'll be keeping it. Some GM vehicles loop the door chime circuits through the radio and maybe any other warning bells as well. Some vehicles also for warranty reasons need the factory radio for the technicians callback codes. When he plugs into the data diagnostic port, the factory radio may read back the error codes. I'm sure that some of the other guys will add more.

Iv seen where the door locks go crazy, and the alarm goes off  when you remove the radio, , , so if he wants to keep his stuff locked up and safe, , they he should spend the $50 for the harness.

the GMRC-01 maintains the integrity of the Class II bus on the E&C  circuit... eliminating an open circuit.... as mentioned it also gives you the chime speaker back and supplies a switched acc power source that is lacking at the radio

we use it here or simply dont do the install.... i wouldnt let a customer cajole me into doing a half a**ed install based on the fact he didnt want to spend the extra $$ needed to do a job properly....

more than the potential safety issues involved, it's pretty much a matter of professionalism..... if a customer cant afford or doesnt want to pay to have it done properly and professionally, it's probably best he deal with one of the myriad of backyard mechanics out there willing to do sloppy installs in their driveway.....