M1 Pos and Neg Connection

Discussion and Support for MoTeC's M1 series ECUs

M1 Pos and Neg Connection

Postby RR213 on Sat Feb 29, 2020 4:37 am

I'm wiring an M150 for a 4cyl application where an M130 would suffice in terms of outputs, the M150 is only required for additional AV and UDIG inputs.

In this application I don't required the maximum current carrying capacity of all of the 3 battery power connections and 5 battery negative connections connected with 18 AWG wire.

I remember reading that the BAT_NEG and BAT_POS positions must be connected on M150 connectors A and B in order to use LS/HS outputs on those connectors. I also recal someone mention the BAT_NEG and BAT_POS connections are all bused together internally. Can anyone confirm?

I'm trying to decide whether to:

Connect only the M130 equivalent positions (C_10 C_11 and C_26) using 18 AWG wire giving 14A of supply and 28A of grounding capacity.


Connect all 5 BAT_NEG and 3 BAT_POS locations on the M150 using 22 AWG wire to give 22A of supply and 37A of grounding capacity.
Posts: 3
Joined: Tue Jul 09, 2019 5:01 am

Re: M1 Pos and Neg Connection

Postby SDean on Mon Mar 02, 2020 8:11 am


My recommendation is to wire in all of the BATT_POS and BATT_NEG pins when doing the loom. This allows for load sharing over all of the pins, and also provides future proofing of the loom in case of further expansion of the functions used.
Stephen Dean
MoTeC Research Centre Melbourne, Australia
User avatar
Site Admin
Posts: 747
Joined: Tue Dec 02, 2014 9:29 am
Location: Melbourne

Return to M1 ECUs

Who is online

Users browsing this forum: No registered users and 5 guests