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Thread: Connecting/Installation diagram for 7730 (Grid) to 7531 (Programmable 7 Plus)

  1. #1

    Default Connecting/Installation diagram for 7730 (Grid) to 7531 (Programmable 7 Plus)

    Our team has decided to upgrade on tuning capabilities on the TD Rail. We got the Grid and the 7789 harness to connect them together. However, the instruction sheet is not clear how to connect as all the literature provided only shows connection to the 7AL2/3. The 7531 comes with the 12-pin plug for connection. Has anyone done this hookup before? There is not much help from MSD on this as I have been trying for sometime now. Both these units are programmable, one MSD Tech said I need to leave parts the 7531 connected for limiters etc. and connect the Grid also. They could not say how the programming on the two boxes would mesh or communicate. Can anyone explain? Thanks.
    Last edited by zaxxon1; 02-06-2020 at 04:58 PM.

  2. #2


    I hope someone from MSD is monitoring the forum, as it seems that I cannot get any assistance from them on this particular issue. One tech from MSD said the 7789 harness should not be used for this connection, only if there's a complete change out. He also said that both the Grid and the 7531 has to be connected and programmed at the same time. Can a knowledgeable Tech please advise. Thanks.

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