Page 1 of 1

External wiring layout Q

Posted: Fri May 04, 2012 7:48 am
by MG David
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?

Re: External wiring layout Q

Posted: Fri May 04, 2012 7:59 am
by jsmcortina
pin 37 isn't a 12V supply - it is a ground output to the coil of the fuel pump relay.

James

Re: External wiring layout Q

Posted: Fri May 04, 2012 8:44 am
by MG David
Thanks James. Looking at the diagram again I can see it.

Any particular reason why it grounds through MS?

Re: External wiring layout Q

Posted: Fri May 04, 2012 9:27 am
by jsmcortina
MG David wrote:Any particular reason why it grounds through MS?
That's how the Megasquirt turns it on.

James