On Wed, 17 Jul 2019 19:50:58 -0700, Jeff Liebermann wrote:

Nope. I'm looking for the model number or name of the transfer box so
I can read the docs which should have wiring and installation
instructions. Not much I can offer unless I know what you have.

I kept looking and found the model number of _each_ transfer switch!
https://i.postimg.cc/ZnS4W9pb/transfer16.jpg

The model number of _each_ transfer switch is: 79848A

Googling for that model number finds an exact lookalike for _one_ box
https://picclick.com/Generac-Transfer-Switch-100-Amp-250-VAC-One-153421838181.html

Here is just one of the eight pictures of that lookalike 79848A:
https://www.picclickimg.com/00/s/MTIwMFgxNjAw/z/LgUAAOSw64NckUJ-/$/Generac-Transfer-Switch-100-Amp-250-VAC-One-_57.jpg
https://i.postimg.cc/1X200QR3/transfer21.jpg

Methinks I found the install manual:
https://www.electricgeneratorsdirect.com/manuals/rts_inst_man_2013.pdf

"Installing Automatic Generator Generac Guardian"
https://www.youtube.com/watch?v=_kWuRHegXuk Part 1
https://www.youtube.com/watch?v=Sk2D3AQITGA Part 2
https://www.youtube.com/watch?v=-Kis7j2XNtw Part 3
The transfer box they used looks like yours. Start at 2:12.
https://youtu.be/-Kis7j2XNtw?t=132
Notice that the terminal blocks are labeled.

That's pretty close!
https://youtu.be/-Kis7j2XNtw?t=132

The manual switch is different, and the generator is different - but it's
similar, where I will go through that excellent video with my Fluke.

I did some digging and found that the only excuse for 2 transfer
switches is two generators, or two different sources of backup power
such as generator and solar inverter.

I checked my main panel, which is definitely 300 Amp mains service (I had
always thought it was 200 amps, but it clearly has a 300 Amp main breaker,
plus 3 separate 100 Amp breakers, where the house has two of them and the
pool has one).

I hate be the bearer of bad news, but you potentially have a miswired
mess. I'm fairly sure it would not pass an electrical inspection in
its present form. If you have time and money, find someone with a
clue and let them fix the mess. My guess(tm) is they would recommend
ripping it all out and starting over with the wiring and installation.

The last guy who worked on that generator is in Santa Cruz, based on the
label on the outside panel, which I found buried under stuff.

This DEFINITELY WORKED so it's NOT miswired. The only problem is that the
solenoids are not automatically kicking on.

Here's what SHOULD happen:
1. PG&E power goes out about monthly
2. The Generac generator automatically turns on
3. The two transfer switches should automatically turn on
4. The house should have two 100 Amps (the pool does NOT have power)
[Although the generator is puny - it's only able to output 67 amps!]
5. When PG&E comes back about 24 hours later - the generator turns off
6. The transfer switch transfers the two 100 Amps back to the mains

Everything above is working EXCEPT - I have to MANUALLY flip the
double-fisted solenoids.

If I switch just ONE of them, I get only half the house.
If I switch the SECOND one also, then I get the full house.

So my main problem is troubleshooting why the double-fisted solenoid is not
automatically turning on.