Occasionally (yet seeming to be more frequently) there will be a 30 second to a minute delay from starting the car to when radio and wipers will get power. I hear a relay like click under left side of dash and then they both work. 

 

Any ideas?

Edited October 27, 20187 yr by greg donovan

I've gone through wiring and ground diagrams and they don't seem to share anything. 

am guessing that the relay is bad. During that 30 second delay, touch the relays with your fingers. The one that you feel and clicks, and turns everything on is likely your problem child. Replace that relay, and you should be good to go.

I suspect that the problem may be with the ACC contact position of the ignition switch. See if the rear wiper doesn't work while the problem is occurring. If that is bad also check the switch contacts. You may need to replace the switch.