Fuse located for windshield wipers

Where is the fuse box located in a 1987 Mercury Grand Marquis? Are there also other fuse boxes located somewhere else in addition to the main fuse panel?

My turn/hazard signals are not working. The fuses are all good. I don't see a flasher in the fuse box under the dash. It stopped working a day ago. What could be the problem? If it is the flasher where is it located? Thank you

Trying to determine if there is an cause I haven't checked>
Initial Symptoms: Sudden loss of all electricals except interior lights and horn. Wiggled the battery terminals (found to be a bit loose) not change. Waited a few minutes fired up with one more mishap on my way home.

Next day, power available (dash lights), but would ebb away within a 10-15 seconds. Swapped for known good battery, swapped main battery cables for known good ones. Checked every fusible link listed in the owners manual and ever fuse in the fuseblock. Also tested a ECM, Fuel Pump, & A/C relays & diode No luck.

Next check, same ebb of power. Swapped ignition switch. Started and ebbed a few times, then nothing. Swapped switch back to original without change.

I get power to the ignition switch when off, but it disappears when the switched to any on position. I haven't found any broken or damaged wires. Engine will crank if solenoid is jumpered. No power to do a ECU test.

Any ideas?