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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
... [Read Article]
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