Dual Precision Pickups Wiring Problems

[back2thebassics]

I just built a bass that was partially Inspired by the Mark Hoppus Signature bass and the Leland Sklar Frankenstein bass I had a friend do the artwork and it turned out really nice

It has two Reversed Seymour Duncan SBP-3 Quarter Pounders and is wired with two volume pots and no tone control

Solo’ed each pickup sounds good, I like the tones from both the bridge and neck position I don’t know why this configuration isn’t used more often, but when I blend the pickups together I get less output and loose all low end. With my limited knowledge this sounds like a phase issue, but I don’t know how to fix it. I did replace the lead wires on one of the pickups and I would guess that’s where my issue is coming from.

There is also a hum when I tough the strings bridge or pots, which sounds like a grounding issue but I’m not sure where the problem is coming from

this is the diagram I used, it seemed like it should work but it also might be a cause of some issues

 

[back2thebassics]

If someone could give me some advice on how to fix the phase issues or take a second look at that diagram for me that would be awesome, thanks guys

 

[Slater]

With my limited knowledge this sounds like a phase issue, but I don’t know how to fix it.

When two pickups are wired out of phase, swap the hot and ground connections of one pickup only to correct the problem.

There is also a hum when I tough the strings bridge or pots, which sounds like a grounding issue but I’m not sure where the problem is coming from

This seems like the output jack is wired backwards.

 

[back2thebassics]

alright i'll swap those 2 connections and report back

 

[back2thebassics]

That did the trick thanks slater she’s hum free now and both pickups blended sound beastly

 

[Slater]

That did the trick thanks slater she’s hum free now and both pickups blended sound beastly

Great!

 

[sikamikanico]

That did the trick thanks slater she’s hum free now and both pickups blended sound beastly

I just built a bass that was partially Inspired by the Mark Hoppus Signature bass and the Leland Sklar Frankenstein bass I had a friend do the artwork and it turned out really nice
View attachment 3902837
It has two Reversed Seymour Duncan SBP-3 Quarter Pounders and is wired with two volume pots and no tone control

Nice bass! Yeah, dual reverse P makes a lot of sense, it’s IMO the “correct” way to do a “PJ” bass... Never heard one with two SPB3s - can you share any sound clips?

 

[JRA]

i've never owned a reverse P configuration (that i remember! ), but i agree with sikamikanico that it's the sensible way to hear the strings. you've got a cool ax there, OP! nice looking in every way! glad you got help with the pickup issue(s).

 

[back2thebassics]

I’ll try and get some sound clips tonight, but yeah the dual reverse P sounds good, and when the two separate volume controls it’s like a massive sounding jazz bass I play it in a punk band I started with some friends from high school and it works well for that