zero reading??

[johnnyoak]

OK...so I decided to just throw the pickups mentioned in this thread guitarnuts2.proboards.com/index.cgi?board=wiring&action=display&thread=5705 into my Les Paul instead until I could get a switch....

Now I have stumbled upon ANOTHER problem.

Everything is wired according to the Duncan 2 bucker, 2 tone, 2 volume, 3 way switch schematic. - www.seymourduncan.com/pdfs/support/schematics/2h_2v_2t_3w.pdf

However, I am getting a zero reading from the input. I am also getting a zero when I test the hot and ground connections at the bridge volume pot. Neck pot reads 7.5ish when tested.

EXTREMELY frustrated...any ideas of what could be the problem or where to start?! Please help. Thanks!!










(EDITed by sumgai, removed parenthesis to make the first link work.)

[ashcatlt]

Let me make sure I've got this straight.

You're measuring DC resistance, right? When you measure between tip and sleeve of the (output) jack, you're getting 0Ω, also measuring across the bridge volume the same thing? But the neck volume gives you "7.5ish". Can we assume that this is 7.5K? Otherwise it's close enough to 0.

First - are you sure that it's reading 0, and not OL, or out of range or infinite or whatever?

2 - Where's the switch when all these readings are being taken?

3 - Is the bridge volume pot all the way up? Are you sure you didn't wire it backwards? Tried turning it the other way and measuring? Do the readings change at all when the pot is rotated?

4 - can you post some well focused shots of your wiring?

[johnnyoak]

ok i started over and re-wired everything....new dilemma, but getting closer i suppose.

0.00k reading on multimeter when:
- touching side of bridge and neck tone pots
- touching side of neck tone and volume
- touching side of bridge tone and volume
- touching side of neck volume and bridge volume
- touching switch wiring points to their respective connections in the cavity (switch to neck volume, switch to bridge volume) and input jack

ALL KNOBS TURNED 100% ON AT THIS POINT:

Neck volume pot-
multimeter reads 7.23k when switch is in neck position and neck pickup hot and ground connections are touched, it reads 0.00k when the switch is in the center position

Bridge volume pot-

multimeter reads 15.5k when switch is in bridge and center positions and bridge pickup hot and ground connections are touched


Input jack reads OL regardless of settings. I then realized that whenever I touch either the metal on the switch or the metal on the jack, the readings fluctuated between 30k and 160k.

Here are pictures of everything: flic.kr/s/aHsjuGL9mA

Is this a grounding issue or what??

Thanks in advance for any insight you can give!

[JohnH]

Ive had a couple of looks but cant tell what might be happening. What is the resistance of each pickup? - are they both supposed to be about 7.5k?.

Measuring resistance across a plugged in cord, what happens when you sweep the volume pots? In B position, it should start at about 7.5k, rise to about 130k then fall to zero. Same in Neck position (starting with neck pup resistance minus a bit). In middle position it should start at about 1/2 of the resistance of a single pup (if they are the same). Sweeping a tone pot should not make a difference to resistance in any setting.

John

[johnnyoak]

Hey John -

Was cutting it close on time with a gig (this is one of my main guitars) and just ended up taking it to a repair tech in the area...I'm kinda new to all of this and trying to learn, but I probably picked the wrong time haha

Thanks for all of your help!!

Johnny