Optical drive fan compatibility
I am trying to replace the optical drive cooling fan in a 20" iMac (A1224, EMC 2266). I purchased a new fan which is Apple P/N 620-3912. Upon opening the iMac, though, I found it contained Apple P/N 607-3309. The only difference appears to be the wire connector.
The old 607 fan in the iMac is connected with a connector parallel to the motherboard as iFixit shows for an A1224 EMC 2266. The new fan has a connector that would plug into a female socket perpendicular to the motherboard (as iFixit shows for the iMac EMC 2133 and 2210).
I'm tempted to simply cut the connector off the old fan and solder it onto the new fan. The wires from both fans are Brown - Black - Gray - Black. The old 607 fan identifies the brown wire as "+" and the gray wire as "out". Does anyone know if the two blacks are both ground? Are they interchangeable? My multimeter says they are not directly connected within the fan (failed continuity test).