OEM Blower Motor Resistor Wiring

After reading a whole bunch of replies, I came up with a root cause for some scenarios and made a fix.
So my resistor having the same issues as most, only works on high setting, is an original from a 2006 Tacoma. That being said , the original is a very high quality and durable part that should not be replaced with cheaper, newer versions.
So out comes the multimeter. I discovered that all the resistors showed some resistance if not just continuity which led me to an external part on top. I appeared to be a resistor but had no continuity. Thing is, from the schematic posted by Caribe Macaira, that would have been one too many resistors. So I deduced that it had to be the fuse. The schematic shows a built in fuse.
So a simple check to prove or disprove my theory. I placed a jumper across the "fuse" and plugged it back in. Problem solved, all fan speeds now working.
Now I don't suggest anyone jump the fuse and call it a day. That can lead to a burnt out motor or worse. It can cause severe overheating which can start a fire. So the fix...
Again it started with a multimeter set to DC amps. You basically jump out the fuse with the probes which puts the meter in series. Then go through the settings. Low is 3A, 2 is 6A, 3 is 7.8A, and Hi was off the scale of 10A but still showed a small reading. I guessed that Hi was 10A plus the small reading so 10.1A
So I cut out the built in fuse and installed an automobile fuse of 10 amps. I soldered in some brass clips from an old cordless battery, which holds the fuse quite firmly and makes it easier to replace. Normally the fuse should be slightly higher than the maximum current but for now I will see how long it lasts. If it blows the 10A fuse I will up it to a 12A but no higher.
A blown fuse is an indicator of another problem. In my case the blower motor seized (from a piece of debris) and that blew the fuse, causing only Hi to work. If your fuse blew, then finding the root cause is key, then the fix will last.
So as of now it's working perfectly, but I've only run it a few minutes on each settings. Time will tell...
Update January 17 2025. Ok, so some time has past and my fix is still working as it should. I drove it on all fan settings for extended periods and it worked perfectly. Seems that the fix will last...

 

It's called a thermal fuse, it's purpose is to blow if the resistor get's too hot due to insufficient airflow or over-current to prevent things from melting/burning.

 

I replaced my resistor with the blade type people said would work. It didn't, so my next task is to replace the blower motor and get the exact resistor to replace it with.

 

Why not test and see what's missing/broken instead of just replacing parts until something sticks?
https://www.tacomaworld.com/threads/2nd-gen-information-diagnostics.784008/#post-28042158