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Old 11-02-2019, 02:11 PM   #1
monkey
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Subframe: Allspeed
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Default MPI Wiring Ignition Diagram/Questions

Hi all,

I've been studying the mpi wiring diagrams. Both Haynes and the Rover circuit diagrams (you can find pdf of them online). They both show how the power is provided from the ignition switch. Bit confused as it shows more than what I've seen before position 1, 2 and crank normally in my laymans terms.

In Rover manual

https://imgur.com/5cekZ2s

In Haynes

https://imgur.com/xSTmScI

Seems the powers double up on the Rover mpi ignition switch?
What are the following and when are they powered? I'm guessing the one with the dots and line connecting across shows where the power comes in and stays when the key is turned?

IN1
IGN2B
IN2
IGN1
IGN2A

Also, just to clarify when is Aux powered?

I'm planning to use the loom for my honda build. Ripping out all the MEMs relay stuff.

Any recommendations on where I should take the Perm 12+, Switched 12+ for the Honda ECU? It seems like the MEMs relay is powered switched 12+ on fuse A4 and a perm live straight from the engine bay fuse box to the Mems relay which then feeds the ECU. Would I drop the 30amp fuse to something smaller for the Honda ecu?

Last question, is the wiring for the starter motor and alternator within the main body loom on an mpi or the engine loom?

Sorry if the questions come across basic and newbie, I dont usually do wiring all that well but trying to get stuck in properly this time round.

Cheers!
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Old 22-02-2019, 11:24 AM   #2
Harley
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The powers are doubled up through the switch so that each contact only has to cope with half the amps. The wires can be kept smaller and go to different places this way.

The ignition barrel items labelled 'in' and 'in2' are powered all the time from the engine compartment fuse box. IGN1 is the same as AUX, IGN2 is the same as RUN. the A and B part of them come on at the same time but they are different contacts.

AUX is powered in the aux and run position, but not crank.

The ECU powers should come from relays, triggered by the wires in the mini loom that originally went to the MEMS relay controller for run and crank.

Alternator and starter are on the engine loom in a mini.
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Old 24-02-2019, 01:46 PM   #3
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Awesome, thanks for the info Harley. Much appreciated.
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Old 25-02-2019, 08:10 AM   #4
monkey
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For anyone needing a link to the rover manuals

http://www.theminiforum.co.uk/forums...perhaps/page-3

They are linked in post 40. You might have to join the forum. Also if you google MPI mini wiring diagram theres pdf links that come up.
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