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Mpi Wiring Ignition Diagram/questions


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#1 GreaseMonkey

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Posted 13 February 2019 - 07:38 AM

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? 

 

Cheers

 



#2 Wiggy

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Posted 13 February 2019 - 11:33 AM

Reading across the diagram is just the terminals. IE, there's more than one terminal per position of the key.

Reading down the diagram is the key position.

#3 nicklouse

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Posted 13 February 2019 - 11:36 AM

you also have them on the forum

 

http://www.theminifo...agrams-redrawn/



#4 GreaseMonkey

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Posted 13 February 2019 - 03:01 PM

Reading across the diagram is just the terminals. IE, there's more than one terminal per position of the key.

Reading down the diagram is the key position.

 

Wow, I completely overlooked the left column! I immediately went to looking at figuring out what reading across to the right is! 

Cheers






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