I have a gfci/switch and need a 4 wire instructions. As none of the diagrams match what i have.

Need clarification...12-3 means 3wires (usually black, red and white) plus a ground wire. A black white and ground wire is 12-2. Standard GFCI wiring is black to gold (screw) white to silver and ground wire to green. GFCI's have more than one way to be wired but normally come with directions. GFCI's can also be wired in conjunction with standard plugs. There are websites that will also show AC wiring diagrams which may be helpful.

I've copied instructions from an Amazon review.
worse than worthless and border on dangerous. Be forewarned, and allow some time to install it correctly; and don't expect any help from the included paperwork.

IMPORTANT THINGS TO KNOW:

- There is no ON/OFF indicated on the switch or the instructions, so there is no way to know which direction is on or off. The picture included is upside down, and shown in the OFF position. If you install it with the switch on top, it will work intuitively with the switch up for ON and down for OFF. (Should be common sense, but doesn't say it anywhere, and the text on the device and photo suggests otherwise.)

In short, here's what the directions should say:

Before you begin -> Leave yellow sticker over top connections unless you want to add downstream GFCI protected outlets/lights - that's straightforward.

1) Strip all connections to 1/2", and use the holes on back of receptacle for direct connection.
2) Connect wires from breaker into terminals in back of switch/outlet. (Hot=Black-Gold; Neutral=White-Silver)
3) Connect white wire from light into extra hole next to the white wire from breaker.
4) Connect one short black wire from outlet into the hole next to black wire from breaker.
(this means all four holes are now filled)
5) Connect remaining black wire sticking out of receptacle directly to the black wire from your light.
6) Ensure all ground lines are properly connected.
7) Push into box, install cover plate and enjoy.

NOTE: This will result in the GFCI working properly, with no GFCI protection for the light. This is the recommended install, so that if the GFCI trips you won't be in the dark. If you want GFCI protection for the light as well, simply modify step 4 and insert the black pigtail into the hot terminal under the sticker.

The directions offer myriad ways to connect this, but are incredibly hard to decipher because the text does not agree with the diagrams. I believe that diagram B1 was the one that 95% of people will need...

Here's the wiring instructions: http://www.leviton.com/OA_HTML/ibcGetAttachment.jsp?cItemId=nNBKTVaZ2nU2mhkps672vw&label=IBE&appName=IBE&LEVCOMP_pses=ZGFA29E0DBC9686AA1D14C9C2AA2763721F62C7F83E969AD4822D897CE157A46A78B7EB01F8BC392D4241779B1759B01270DF9EBAAD8B4427C&minisite=10251

If you have two hot wires you maybe set up for 220vac. If this is a 110vac circuit you have a hot in & hot out . Did the electrician run a designated circuit for the spa? GFCI comes with instructions. Find the breaker and check the voltage. You don't want to burn up the spa.

If you have GFCI switch, then copy following link to help wire the GFCI:
http://waterheatertimer.org/How-to-wire-GFCI.html

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Copy following for wiring diagrams showing GFCI combo switch-outlet
http://waterheatertimer.org/How-to-wire-GFCI.html

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Question is a bit unclear and wires are not known.
Are both GFCI devices inside same box?
Not necessary to install 2 GFCI devices inside same box since second outlet/switch can be protected using one GFCI.

1) Typical GFCI outlet device has 4 terminal screws (plus green ground screw for bare copper ground wire)
2) Two of the screws are labeled LINE. These screws are where the black Hot wire and white Neutral wire are connected. Black goes to brass screw and white to silver screw. And now the device has power to outlets, and both outlet are GFCI protected.
3) Two of the screws are labeled LOAD. These screws are where you attach additional outlets/switches that you want protected by GFCI. All outlets connected to LOAD screws would be GFCI protected. So attach black and white wires and run them to an ordinary outlet/switch and it will be GFCI protected. The key is to connect wires to the LOAD screws.
4) If you are using the outlet/switch combo GFCI device, then the same wiring shown above applies. The difference is the wires sticking out of back of device are for the switch. For example if switch controls a light, the wires going to the light connect to the two wires on back of device.

Dave, So you have a GFCI outlet, and a 3way switch and a 3way dimmer switch, right? First off, if you want the GFCI to protect the switches & light you will use both output terminals of the GFCI which have tape over them. The white wire (from the silver screw output of the GFCI) will go to the lights, passing through the switch boxes, but not connecting to anything. The black wire (from the brass screw output of the GFCI) will feed the first switch. Both the switch and the dimmer must have 3 terminals (plus ground). One terminal is the input/output, the other two are "travelers". On a full size switch the input/output will be on the top and the two travelers will be on the bottom (or upside down from this - the key is that the travelers will be on two sides of the switch but on one end. There will be 3 wires (plus ground) going between the two switch boxes 1-the neutral which does not connect to either switch, 2,3 the two travelers. Connect the two traveler wires to the two traveler terminals on the dimmer. The other terminal on the dimmer is the hot wire output to the lights. I hope you found this helpful. Good luck

power coming in from the breaker box: black wire will go to line-hot screw, and the white wire will go to the line-white screw. the switch wires coming out of the back of the gfci- 1 will go to the load-hot screw & the other black wire will wire nut to the black wire going to the light. the white wire going to the light must go to the load-white screw.

power coming in from the breaker box: black wire will go to line-hot screw, and the white wire will go to the line-white screw. the switch wires coming out of the back of the gfci- 1 will go to the load-hot screw & the other black wire will wire nut to the black wire going to the light. the white wire going to the light must go to the load-white screw.