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1994 6.5 diesel wont start

So yesterday I got in my tuck (1994 6.5 turbo diesel suburban) and it would not start. I drove it the day before with no problems. There is no glow plug light on the dash and the starter will not turn over. When I turn the key on everything goes on and off. It’s like someone is turning a light switch on and off over and over. If I try to crank it over the starter gives one click and everything shuts off for a minute. If I let is just sit there with the ignition on but not cranking everything will click on and off for a minute and then everything will shuts off for a minute just like it dose when I crank on it. The batteries are good. Whatever it is it seems to control power to both the starter and the glow plugs and I am not sure where to start.