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snow plow wiring
Sorry, but those single pole relays are not going to allow you create a reversing circuit for your motor. You will need double pole relays to reverse the motor leads.
With the switch you have the 12V + would go to the center switch contact and one coil lead from a relay say "U" would be wired to a open contact on the switch. The other coil lead from "U" would be wired to chassis ground.
The other switch contact would be wired to a coil lead on the second relay say "D" and the other coil lead from "D: would be wired to chassis ground.
Now when the power is on and the switch is operated in one direction it routes power to one of the relays and when you operate the switch in the other direction the other relay will pick up. Releasing the switch it should return to center and no relay will be picked up. If you thinhk this has helped let me know, I can explain the to you how to wire the relays and motor.
One problem the type of circuit you are trying to create is the relay will not drop out as fast as you change directions on your switch. The result is both relays will try pick up at the same time, shorting your suppy voltage to ground. On this type of circuit we would normally interlock the relays electrically, but that is another story.
If I could figure out how to post a photo I'd draw it up and post it.....
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snow plow wiring
Seeing you are doing a home brew project. Check "Surplus Center" They have an item 11-1569, that will do the complete job for you. Just make sure the relays have 12 volt coils, you could use your swich in place of the pendant if you wanted to, but I bet the 2 pushbuttons are interlocked mechnically to prevent picking up the up/down circuits at the same time. This should help I hope. www.surpluscenter.com
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snow plow wiring
Yep, it's 12 volts, capable of 150 amps. It's a little big, but will do the job and there is a wiring diagram included.
http://www.surpluscenter.com/item.asp?catname=&qty=1&item=11-1569
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snow plow wiring
Take a look at my photo #6, I drew this up quick, this may help you. Notice the 2 relays each use 2 normally open contacts. I would put a auto reset circuit breaker in the line that feeds this. Don't know how big the motor is or how much power it draws. In the up mode, the + is connected to the bottom of the motor and the ground connected to the top. Down, the + is connected to top of the motor and the ground to the bottom of the motor. As you can see if you move the switch from up to down too fast the relays may overlap control and flash over.
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snow plow wiring
I've added a photo 7, which will work using the relays you have. It will work, but has a high potential for flash over. The Red arrows would indicate the current flow for UP. The green arrows would indicate current flow for DOWN. I didn't understand your numbering for the contacts on you relays, but they are what is referred to as a form "C". If you can look inside the relay, the moving contact would be the terminal that goes to the motor leads. The normally closed and normally opens should be wired like shown. If you get it wrong the motor may run all the time or not at all. Be sure to use an auto reset automotive circuit breaker in the hot lead. There is nothing worse than having the parts and not being able to get it to work. I’m currently building a 300 PSI PTO driven tree sprayer and adding hydraulic tilt to my snow blower chute. G'day
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