What does each fuse run under 1989 Buick regal

when you remove the fuse cover, the diagram and list is generally posted to the inside of the cover. If you lost the cover, you may try a junk yard and see if you can find a fuse box cover.

check part numbers on enjectors

I'm not sure I am following your problem.
A transmission holds 10-15 quarts including the torque converter. When you drain the fluid you are changing about 4 quarts of the full amount.
Once you fill the transmission to the full mark on the dipstick, you should not be adding more fluid unless there is a leak. Or if the vac modulator is damaged and allowing fluid to be pulled into the engine. The fluid is checked with the engine running in park.

fuses are usually located somewhere inside the car and under the hood..open your car doors and look for a fuse panel..and look under the hood for a second fuse box

I RECOMMEND TO GET SOME ONETO LOOK AT IT A MANUEL WILL BE THE BEST HELPER.

the one with the smaller motor usually passenger side fan

Try to operate the horn. The horn relay or the switch in the steering wheel has gotten stuck in the closed position. Hopefully, this doesn't happen again, but if it does, try hitting the relay under the dash, on the passenger side (if that's where it's located in this model).

May have to search for where the relay is exactly.

Good luck on this repair.

In the engine compartment. Under the black plastic cover on the passenger side. next to the fuse box by the metal crossbar

look up under steering you wiil see it

First things to check would be fuse(s) at dash & under hood, as well as rad fan relay & possibly coolant temperature sensor.