You didn't do anything wrong by pressure washing the engine compartment. Just something that needs to be done...
You most likely broke a wire, knocked an already weak connection apart with the wand or water jet.
Since you have no power, it should be fairly obvious. Do the test with the ignition or lights on so there will be a load on the system. Start at the battery itself. Check across the actual posts, (not the cables) first. Then start moving one test lead at a time, post to cable end, to other end of cable, etc. There will be a main power feed, a smaller wire coming off the positive battery cable, either down by the starter, or up at the battery. Follow that wire, checking with the test light or volt meter to ground.
The wire may go to a fuse, or a fuse link, or directly to the amp meter (if equipped). Look for a broken wire, heat discolored connection, rusty or corroded connection. Is there power at the big wire on back of the alternator? If not follow that wire, it should be hot all the time, should go directly to the battery cable or amp meter.
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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