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Aria Pro II SB-R60 wiring

Hi - I have a nice 1982 Aria Pro II SB-R60, you know the one - neck through, single pickup, passive, vol & tone - and a microswitch! This is what I'm interested in - mine has three positions for the switch. Towards the neck, bright - centre, off completely - towards the bridge, deep. It looks like an ordinary DPDT microswitch, but I'm wondering why the centre should be off completely.

I can't find a wiring diagram for this bass. It has a four-conductor pickup (which I believe is an MBII) and I think the switch is simply switching between coils in parallel and in series. Graeme Fyfe's pages have a wiring diagram for a passive single pickup SB bass but it's for a two-conductor pickup so isn't correct for my bass.

Does anyone have a diagram for an SB-R60?

I've attached a diagram of how mine is wired, including the switch.

Cheers
Nigel
 

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