I'm not familiar with how the Sealux D70 connectors are wired, so this might not be much help, but please see info below describing D70 - Z-220/Z-220S compatibility with Nexus D70 housing. Chances are if the wires are a straight pass through, the Focus Light and Target Laser will not work.
-Mark Rupert
Inon Strobe - Nexus D70 Compatibility*
There are two versions of the Nexus D70 housing. Each version has different compatibility with Inon strobes.
The difference is the D70 housing’s “camera connector” cable, linking the camera’s hot shoe to the housing’s bulkhead connector.
System type 1: Camera connector cable name: “NCC-TM”
This is a straight, direct connection of all five connector wires, between the camera and housing.
For Z-220 / Z-220S:
-Do not install the Magnet into the Camera Type Switch.
-Manually triggered flash possible, with “Sea & Sea Sync Cord N” sync cable, but only through housing’s Main Bulkhead Connector, not Sub Bulkhead..
-Z-220 Focus Light and Target Laser do not operate with this connector cable type.
System type 2: Camera connector cable name: “NCC-V2”
This connection has a diode with some circuitry between the camera and the housing.
For Z-220 / Z-220S:
-Install the Magnet into the Camera Type Switch.
-Manually triggered flash possible, with “Sea & Sea Sync Cord N” sync cable connected to either Main or Sub Bulkhead Connectors.
-It is possible to operate the Z-220 Focus Light and Target Laser with this camera connector type.
-Regardless of whether or not the camera’s power set to ON or OFF, and regardless of half-shutter press, with the Z-220 connected to housing via a “Sea & Sea Sync Cord N” sync cable, the Focus Light and/or Target Laser will be activated merely by turning the Z-220 Main Switch to the A-WIRE position (Focus Light and Target Laser activation), or X-WIRE position (Target Laser only activation).
Note: For Focus Light only activation, use A-WIRE position and close the Target Laser Cover Switch to block the Target Laser
* Compatibility based partially on actual testing and partially on reports from users. There may be undocumented differences between camera/housing systems, which result in difference to above information. Inon does not warranty compatibility with all camera/housing systems.