MoTeC M150 5v Rail Wiring

Hello all,

I tried searching for this without much luck. I know that the M1 series ECUs have multiple rails for the 5V (A, B, and C) and I know the reasoning behind separating each for certain operating functions like critical sensors being separate from non-critical. However, each of these rails has multiple pin assignments on the ECU. For example, the "C" rail has pins A10 and A18 for 5V, and pins A26 and A27 for 0V. I'm assuming due to amperage limits on the pins and/or wiring planning? Is it best practice to pick one of those pins for 5V and one for 0V and run all of my "C" sensors to and from? Or can I take A10/A18 and combine them for 5V before I branch it out to the sensors?

Just use the pins for convenience. If you connect your current wiring to just 1 5V pin, then if you need to add additional sensor wiring later, you just have to insert a pin instead of adding a splice. The 5V supplies have very little current capacity, so that is not the reason -- I think they just end up with a few extra pins and say "what would be the best use for these" -- power supply and grounds win out.

If I were to put a request in to MoTeC for future designs, I would say always put the 5V / 0V for a supply on a single connector.

Thank you David. This is an harness I don’t plan to add to later. Any future items will be handled through a planned spares connector. And yes I agree the organization of the pins makes planning the bundle a pain. I had planned to just bring all four connectors to a big branch point before I break everything off to its necessary bulkhead connector.