Can someone help with the main relay on M50?

[Jon K]

I am trying tap the switched +12v side of the main relay so that I can power my aftermarket ECU from it. I successfully pulled the relay and such and started probing but I ran out of time.

so yeah, I am trying to tap the switched power from the main relay, but i don't have a diagram and i don't feel like probing it and shorting something that shouldn't be.

anyone have a reference for main relay on M50 non vanos?



#4 is the main relay.

[winfred]

pin 87 is the switched power 30 is the supply 85/86 are the switching

[Jon K]

pin 87 is the switched power 30 is the supply 85/86 are the switching

Thanks winfred, so hook up megasquirts 12VDC input to 87?

Also, do you know if the injectors are fused?



The MS diagram assumes the injectors will be getting 12VDC from the main relay also... is this true?

[winfred]

yes to 87, no to fused and yes to 12v from main relay

Thanks winfred, so hook up megasquirts 12VDC input to 87?

Also, do you know if the injectors are fused?

The MS diagram assumes the injectors will be getting 12VDC from the main relay also... is this true?

[Jon K]

yes to 87, no to fused and yes to 12v from main relay

LOL I like your answer format.

should I fuse those bad boys, as a 'just in case'?

[winfred]

only if you think you are going to build a crappy short prone harness seriously i wouldn't, one more place for corosion and bad connections

LOL I like your answer format.

should I fuse those bad boys, as a 'just in case'?

[Jon K]

only if you think you are going to build a crappy short prone harness seriously i wouldn't, one more place for corosion and bad connections

The MS ecu is fused 2A, so I assume if something is wrong that'll blow before the injectors catch fire

[angrypancake]

Thanks winfred, so hook up megasquirts 12VDC input to 87?

Also, do you know if the injectors are fused?



The MS diagram assumes the injectors will be getting 12VDC from the main relay also... is this true?

ho-lee-****. am i just thick or is that confusing as hell

[Jon K]

its not that bad actually

[winfred]

if i had to i could draw that from memory it's just a simplified wiring diagram, you want confusing look at a old volvo schmatic

ho-lee-****. am i just thick or is that confusing as hell