6 wire 1 phase motor with no lead markings

[Huntxtrm]

I have a aircompressor, that I am trying to figure out the wiring on. I have honestly never ran into this before, and need to get this going. Good thing is, it's mine. So if I blow it up, only person mad will be me. LOL It is marked on the motor 120/240v 1phase. it has 6 wires. It does have a start capacitor. I ohmed the wires. 2 sets of the wires, ohm. 1 wire to 1 wire. Like they are windings. 1 set of wire ohms, and climbs, like they go to the capacitor. Any suggestions? I want to wire it 120v for now, but will go 240v later on it.

 

[ActionDave]

Four of the leads are going to be your running windings (traditionally numbers 1,2,3,4) and two of them are your starting winding (5,8). There are more turns in the running windings so there should be more ohms. Sometimes the starting winding leads are coloured red and black.
Ohm them out and label or mark someway that makes sense to you.

I would uncouple the motor from the compressor and wire it up 240V and test it using 120V.

240V wiring L1/hot connect to 1, wire nut 2,3,5 together, L2/neutral 4,8. Test the motor. It will start a little slow but come up to speed in a few seconds. Put an ampmeter on the lead going to the starting cap. When the motor comes up to speed the amps should drop to near zero. If it doesn't you don't have your leads marked correctly.


120V wiring L1/hot - connect to 1,3,5 L2/neutral - connect to 2,4,8

If the rotation is backwards switch 5 and 8.

 

[Jraef]

This should help in that endeavor. If you only have 6 wires, and the nameplate says it is a reversible motor, then you don't have the thermal protector separate from the internal connections, it is in series somewhere. If the nameplate does NOT say the motor is reversible, then the 2 extra wires might be the thermal protector. They will often be grey.

 

[Huntxtrm]

This should help in that endeavor. If you only have 6 wires, and the nameplate says it is a reversible motor, then you don't have the thermal protector separate from the internal connections, it is in series somewhere. If the nameplate does NOT say the motor is reversible, then the 2 extra wires might be the thermal protector. They will often be grey.
View attachment 12516

That's the diagram I have, also. Not on the motor. All the wires are white, none are identifieable from another. Nameplate is almost unreadable. I may just get a newer motor, if I fry this ones chicken.

 

[Jraef]

That's the diagram I have, also. Not on the motor. All the wires are white, none are identifieable from another. Nameplate is almost unreadable. I may just get a newer motor, if I fry this ones chicken.

But if you do what ActionDave said and compare your findings to this drawing, you should be fine. The pair that charges up would be the pair that has the cap on it. The rest you already identified.