External wiring layout Q

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External wiring layout Q

Postby MG David » Fri May 04, 2012 7:48 am

If I understand the external wiring layout for MS1 V2.2 board, it shows 12V supply provided to 2 pins on the DB37.

Pin 28 has 12V via a 3A fuse from the main relay.
Pin 37 has 12V unfused from the fuel pump relay.

I will only be using MS for ignition and data logging at this stage so my fuel pump will continue to be powered in the way it is currently.

Is it OK to power both pins 28 and 37 from the same 12V source?
MG David
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Re: External wiring layout Q

Postby jsmcortina » Fri May 04, 2012 7:59 am

pin 37 isn't a 12V supply - it is a ground output to the coil of the fuel pump relay.

James
I can supply, repair or upgrade Megasquirts in UK.

My Success story: viewtopic.php?f=104&t=34277
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Re: External wiring layout Q

Postby MG David » Fri May 04, 2012 8:44 am

Thanks James. Looking at the diagram again I can see it.

Any particular reason why it grounds through MS?
MG David
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Re: External wiring layout Q

Postby jsmcortina » Fri May 04, 2012 9:27 am

MG David wrote:Any particular reason why it grounds through MS?

That's how the Megasquirt turns it on.

James
I can supply, repair or upgrade Megasquirts in UK.

My Success story: viewtopic.php?f=104&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
jsmcortina
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