It would depend on the brand awning you have and the brand slide you have. We had a Carefree electric awning on our previous Greyhawk Motorhome. It came with some electrical leads to connect to a 12v source to override the switch in case of failure. The slides could be manually retracted with a wrench if they failed.
-Michael
Michael Girardo
2017 Jayco Jayflight Bungalow 40BHQS Destination Trailer
2009 Jayco Greyhawk 31FS Class C Motorhome (previously owned)
2006 Rockwood Roo 233 Hybrid Travel Trailer (previously owned)
1995 Jayco Eagle 12KB pop-up (previously owned)