I purchased some used Bartolini 6 stirng pickups and they do not seem to fit the split coil wiring diagram on the bartolini web site. The model # in the back is: 90M56NR2DD or DP On the back there is 3 posts with wiring (from left to right) White, RED, Green The black wire and the ground wire are solderd together and directly to the copper plate on the back of the pickup. I cannot seem to come up with a wiring configuraiton that produces ANY output. Any ideas of what this is? Thanks!