OKAY. So let's try to get to the solution. The switch in this case appears to be Transfer Switch No. 3, p/n 84222-35070 aka ADD Inicator Switch A10 on the '99 EWD. That connector housing is p/n 90980-11250 if you want to buy a new one and you have usable wire treminals lying around. It is a gray two-wire plug, just to confirm.



So a little Googling reveals that this switch is used as back-up light switch on several other models and is in enough demand that a bunch of folks carry the whole pigtail. The pictures show these do match up to the pinout A10 diagram in my '99 paper EWD, page 204. Suppliers include:

Home >> Shop >> Connectors / Harnesses >> Yazaki >> 2 Way Connector Plug Pigtail for Toyota Transfer case, backup lights 90980-11250 (BUL & 4WD indicator)

Amazon.com

Walmart.com

Here is the end-on shot of the first pigtail above. Clearly a good match to the male switch above:



Note again that what Toyota sells under this p/n is just the housing, no wires, and the MSRP is $12.15. You would then need two repair wires, if you can't junk source them. They are pretty common. But I can look up the p/n for them if your heart is set on new OEM replacement. I just can't do it on this computer. The housing looks like this:



Hope this helps...