car don't crank or run

i got 1999clk320 mercedes-benz n don't or run crank and the batteries are new and the stater is new . i did a test and put a remote starter cable on the stater the engine crank but did not run while cranking the engine i test for spark on the sparkplugs no spark i put a test light on the fuel injections the light only stay on while cranking no blink . the fuel pump work is good . but the engine don't run or whit the ignition switch . i need help