Rear turn signal wired wrong, now problems...

[Vicecube]

Hi all, Really hope someone can assist me here. I have been working on my '77 CB750 this winter was just finishing up a few 'minor' tasks before calling it good for riding... but, as luck has it...I just made a boo boo.
Tonight I was rewiring my tail lights and rear turn signals. Had left signal and rear confirmed all working and then connected my right turn signal to wrap up - when I turned the ignition on to check and confirm, nothing worked (headlights, tailights, horn, turn signals, etc)... Looking to see what I did wrong, I realized I made a stupid mistake and connected the turn signal to the ground and vice-versa (probably in my excitement to be finished).
I assumed I had just blown one of the 3 fuses that are accessible, but all three still seem to be in working shape.
Anyone have any ideas where to start here to track down wtf blew?
Thanks for any advice.

[TOOLS1]

Just because the fuses look good, does not mean they are good. Also, you might want to check the wire connections at the back of the fuse block.
TOOLS

[Vicecube]

Thanks TOOLS, yes - all fuses were confirmed good with ohm meter.  I'm trying to figure out what else may have taken out all of my accessories (headlights, turn, tail lights, horn) - are these all powered through the regulator?  Maybe that was damaged?  I just turned on the ignition (not started bike) and measured voltage across the black/green and white/green on the regulator - both came back as 0V.  I never measured these prior to this issue though so not sure if that's expected if bike is not actually running or not...any idea?

[Vicecube]

And I'm confident the wiring on back of fuse box is OK because everything was confirmed working about two minutes before I connected the wires wrong :/

[TOOLS1]

Vicecube wrote

And I'm confident the wiring on back of fuse box is OK because everything was confirmed working about two minutes before I connected the wires wrong :/

Well, shorting it out certainly could not have damaged the wires on the back of the fuse block, so that definitely could not be the problem. Also, the only thing going through the rectifier and regulator is the AC electricity coming from the stator being turned into DC electricity going to the battery. Has nothing to do with the bike going dead in a few minutes.
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[Vicecube]

Fair enough.  Your point is valid -  I did find a couple interesting things tonight... (1) looks like the fuses were all 15A from one of the previous owners so all but the main were oversized (yep, wish I would have checked those previously).  I also found that when I turn on the ignition, something is connecting the main to ground so seems something was damaged that gets connected when ignition switch is engaged.  I disconnected the black line from the regulator just to remove it from the circuit.  Doing this does keep the main from being grounded when ignition is turned on...doesn't necessarily mean the regulator is the problem for sure, but must at least be something downstream from the regulator connections.  I then checked the resistance between the black and green lines on the regulator and it shows around 6ohms - seems low but not sure what it should be.  Any idea what resistance between black and green is supposed to read when measured across the regulator?  Also, my regulator is labeled TL1Z-38 12V607...it looks like there are a lot of TL1Z-38 12Vxxx regulators - any idea what the last 3 numbers represent?

[TOOLS1]

Shopping days until Christmas?
TOOLS