1999 gmc suburban When key is turned to on & cranking no warning lights, no clicks, nothing. What is the best way to test the system to determine what needs to be replaced or repaired?

SOURCE: 1999 Ford Taurus Wont Start

Tapping the starter does not always work. I would check all the connections on the battery and starter. If these are good replace the starter. Don't forget the grounds.

SOURCE: 1999 gmc suburban fuel pump

I had the same problem with my 99 suburban. There was a memo sent out by GM to all of the service shops that tell them when you replace the fuel pump or just desconnect it you need to replace the pigtail wiring harness that connects to the pump or it will burn up the new pump. I went through 3 pumps before I found this out after I replace the pigtail it fixed the problem.

SOURCE: 1999 GMC Suburban Wont Turn Over

It sounds like you have a security problem, I had the same thing it would fire and run for half of a second and then that was it if anything at all. Had the security system rebooted, now it starts and runs fine.

SOURCE: 1999 GMC Suburban. no sound from radio

there is a plug at the back of the radio connecting it to the vehicle wiring loom. If you can get at thes plug, either from below or by removing the radio unit, make sure the plug is tight and secure. I can't think that the amp has gone or you would have lost all sound, so this is more than likely the problem.

SOURCE: my 1999 volvo s80 won't start. turn the key

On your year there would be something , like cranking , if the security is set. I would start with checking the fuses and then work my way to the starter relay. then I would go to the starter.