Need help wiring new partscaster

[newey]

Apr 27, 2022 21:20:51 GMT -5 chumpy36 said:

Is it possible I have the operation wrong? I want both coils when the push pull is down. It APPEARS that it's reversed (is there a way to check?).

The CTS diagram numbers the lugs differently, but if you followed their diagram, the coil split should be when pulled up, same as what I showed. You can certainly check it with your meter, the coil split setting should be roughly half of the resistance of both coils in series. However, to check it accurately, you would need to factor out the pot loads on the circuit, since you have it all wired up with the pots in circuit.

To get an accurate reading of all the values, you would follow ChrisK's instructions from these threads Since yours is a HH guitar, the second link is closer to what you have:

Discerning Strat-type resistances

Discerning LP-type resistances

But since all you really need to know is if the coil split is right, we can not worry about the pots and just get an approximation. Make sure all pots are turned up to "10", put the switch to the neck position, and test the resistance of both switch positions. The single coil split position should be substantailly reduced form that of both coils, roughly half.

As ChrisK suggested, this can be done at the jack by using a guitar cable and putting the probes of your meter to the tip and sleeve of the cable. But since your is apart, you could just take your measurements from the jack connections or elsewhere. Either way, it is a bit fiddley to have to hold the probes in place while operating the meter, so I find it helpful to use an old faulty guitar cable from which I cutt off the bad end and soldered a pair of alligator clips to the wires, so I can clip to the probes of the meter and not have to hold them in place.

[chumpy36]

Apr 28, 2022 5:00:32 GMT -5 newey said:

Apr 27, 2022 21:20:51 GMT -5 chumpy36 said:

Is it possible I have the operation wrong? I want both coils when the push pull is down. It APPEARS that it's reversed (is there a way to check?).

The CTS diagram numbers the lugs differently, but if you followed their diagram, the coil split should be when pulled up, same as what I showed. You can certainly check it with your meter, the coil split setting should be roughly half of the resistance of both coils in series. However, to check it accurately, you would need to factor out the pot loads on the circuit, since you have it all wired up with the pots in circuit.

To get an accurate reading of all the values, you would follow ChrisK's instructions from these threads Since yours is a HH guitar, the second link is closer to what you have:

Discerning Strat-type resistances

Discerning LP-type resistances

But since all you really need to know is if the coil split is right, we can not worry about the pots and just get an approximation. Make sure all pots are turned up to "10", put the switch to the neck position, and test the resistance of both switch positions. The single coil split position should be substantailly reduced form that of both coils, roughly half.

As ChrisK suggested, this can be done at the jack by using a guitar cable and putting the probes of your meter to the tip and sleeve of the cable. But since your is apart, you could just take your measurements from the jack connections or elsewhere. Either way, it is a bit fiddley to have to hold the probes in place while operating the meter, so I find it helpful to use an old faulty guitar cable from which I cutt off the bad end and soldered a pair of alligator clips to the wires, so I can clip to the probes of the meter and not have to hold them in place.

Ok, tested with a guitar cable. When the switch is down I get 3.49 (20k ohms setting) when I pull up it goes to 6.96. So it seems to me I have it backwards?

[chumpy36]

I sussed it out. Seems that wiring diagram is for the split to be on the up push not pull. I switch the green/ground wires from terminal 2 on the cts switch to 1 and grounded 1 to the case and all came good. Now with the pot down it gives 7ohm ish and when pulled up goes to about half. 

Seems right?

We'll see how reliable my bad soldering is but I THINK I have it right. At least it's time to get a neck on it and get the nut slots cut. I can then properly test it. 

Thanks everyone for the help and the patience!

J

[newey]

Apr 28, 2022 19:29:34 GMT -5 chumpy36 said:

Seems right?

Yes. Let us know how it turns out(and sound samples are encouraged )

[chumpy36]

I'll have it back in a couple weeks from it getting the finishing touches. Will make some recordings then. 

Thanks!

J