How should 4 conductor connect to each coil?

[chris effect]

I bought a used jb. With red & white taped off, and green and ground taped off I get no DCR when measuring black and ground.

When I measure ground and red + white I get~4k

Do I have a dead coil? I've pulled it apart and the connections on the coil end look OK I guess. I'm starting to wonder if Its been opened before I got it. All I've done is a screw and mag swap. I don't know if you can tell what's what here...

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[Ayrton]

Re: How should 4 conductor connect to each coil?

Red/white together and connect your meter to the black and green. Leave the bare alone

Do you get a reading?

 

[chris effect]

Re: How should 4 conductor connect to each coil?

Red/white together and connect your meter to the black and green. Leave the bare alone

Do you get a reading?

Yeah, 7.99k. And for $h!t$ & giggles I tested black and green & now I'm getting a full 16.4k - thats with or without the bare attached to green. I don't know if I knocked something around or what. I tried this like 20 times earlier and got no full reading... I did cut the wires back about an inch and restrip everything, but I called myself testing after that. I appreciate the help.

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[Adieu]

Re: How should 4 conductor connect to each coil?

I bought a used jb. With red & white taped off, and green and ground taped off I get no DCR when measuring black and ground.

When I measure ground and red + white I get~4k

Do I have a dead coil? I've pulled it apart and the connections on the coil end look OK I guess. I'm starting to wonder if Its been opened before I got it. All I've done is a screw and mag swap. I don't know if you can tell what's what here...

Sent from my XT1650 using Tapatalk

4k means you're running the coils wired parallel instead of series. And it also means that BOTH COILS ARE INTACT


On a hot overwound pickup (JB, DD, Invader, SD, etc.):
14 - 16k : humbucking series *usual setting*
7 - 8k : one coil only, *coil tap or wiring error*
3.5 - 4k : parallel --- rarely intentional

 

[GuitarDoc]

Re: How should 4 conductor connect to each coil?

None of what you described makes sense.

If red and white are connected and green + ground are connected, the only way you could get 4k measuring between ground and red + white is if black is touching ground also (this would be wired in parallel).
And the only way you could get NO reading when measuring between black and ground is if the red and white wires are NOT connected. The fact that you got a 16.4k reading later would indicate an intermittent connection between red and white.

With all of the wires separated, if you measure between black and white you should get the resistance of the north (slug) coil only. If you measure between the red and green wires you will get the reading for the south (screw) coil only. Each of these measurements will be 7-8k.

If you connect the red and white wires together and measure between green and black you will get both coils wired in series (humbucker), about 16k. With red and white connected together and black and green connected together, measuring between black + green and red + white you should get about 4k, both coils wired in parallel (humbucker).

 

[chris effect]

Re: How should 4 conductor connect to each coil?

Thanks for the info Doc. I'm not sure what I did or what was happening. It all seems to be working as it should now...

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