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I have seen red battery holders in late AB units also, probably several suppliers for a same part. The early AB boards had a small top metal stiffener serving as a cooling device also, and the cardboard shield was brown instead of white IIRC

The original Macintosh had a mouse with a big connector and thumbscrews (so this is correct) the PLus had the thinner/samll one.

I agree with Finkmac, UE8 bad or broken trace around it. UE8 is 74LS166 IIRC

Hi, yes, i also agree, the LED will lit as soon as connected to mains. The PSU is just a Powermac 6400/6500 one in the BOSE enclosure, nothing fancy

So your capacitors are ok. Again. your PSU is not an original unit but a clone, you can use your multimeter for checking outputs from it, probably one or more are bad.

You should look for a short, not voltage. Using the continuity mode of the multimeter, look for any, you should not get a short between the positivé and négative side.

Hi, sorry not diodes but capacitors (my fault) those are the ones on the top left of the motherboard (C9/12/15/17) But looking at the PSU, this is not an original unit, more a clone, and most are poor in quality. I will not be surprised if it’s bad.

Hi, The blinking led is related with a shorted component, and the IIe is known for logic board diode failures. Have a look at the bullet diodes near the PSU connector, and check for a short unit.

Multimeter

Yes U3

Any hard drive will only need 5 and 12 volts, so wiring it from the Apple II PSU should not be hard.

hook an old hard drive to the Apple II PSU and reset voltages

Try replacing the Optoisolator, maybe your issue here.

Hi, can you remove the retaining screws from the motor and leave it connected (hanging aside) then try to eject the floppy ? That will make a quick test for troubleshooting your issue. If the motor is Ok, it will spin freely.

Hi, can you have a look at a trace that looks dubious ? Just above a capacitor.

Hi, i don't understand how your 12 v line can be so low.... have you cleaned the board thoroughly ? cap juice can do a lot of weird things.

Hi, can you have a look at the four diodes (CR22 to CR25) on the right of the board ? Those are serving the purpose of diode bridge / rectifier. If one of them is shorted, the fuse will blow.

This is an issue with the Hybrid chip going bad or contaminated by capacitor goo. At some point, the problem can be solved by cleaning the area and heating the pins with hot air after getting some flux in those same pins. A new Hybrid chip has been designed...

Nothing obvious, maybe a bad solder joint in the connector side.

Are you sure the drive is still ok ? Most are junk today, and Scsi Probe is probably only able to detect the board, but not much more.