Dan,
The switches are rockers with lights on them.
I found the Yeti fuse, it checks fine with ohm meter. I tried checking for 12 volts in fuse box but did not see a reference point for the ground lead of the meter.
How would i get to the relays?
You may want to revisit 12V at the fuse. If you unscrew the fuse box cover, it should expose where the thick wires attach for incoming 12V and ground. There's also a ground buss where all the ground wires attach. Any of those will work for the ground lead of the meter.
On a fuse box with fuses arranged in a vertical stack, the right side is usually power to the fuse and the left side is power through the fuse and on to the switches. You should have 12V DC on each side, to ground.
Don't overlook the possibility of labeling error in the fuse box. Check each fuse position.
If that checks out, go to the switches. Unscrew the mounting plate for the switches and carefully pull it away from the wall. The careful part is to avoid pulling any wires loose from switches. Use your phone to take a picture of the backside of switches so you have a reference in case wires come off while checking things. Test for 12V on each side of each switch. If you have 12V on one side but not the other, flip the switch to the ON position and check again.
It seems unlikely that both switches or both parts of the YETI system would fail at the same time. It's way more likely you're not getting 12V to the switches.