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I have used up all the low side outputs so want to use a spare ign output to drive a relay.

Will this work and do these function as high side outputs?

Just realised these are logic level outputs so hence the reason it doesnt work!

One of the highside outputs should be able to do it though.

Due to some quirks of the setup we have a highside driving a solid state relay on the dirft car.

i think key idea is that we have two kinds: some high current high and some lower current ones

Regardless of current the 5v may not be quite enough to get a relay to activate.

It's normally enough to keep one open once it has moved but not to get it to start moving.

I guess the question is, what are you after an extra relay for?
Is there another way it could be handled?

I am also curious how you have run out of 16 lowsides?

Its a relay to power the WBO2 sensor heater.

The existing outputs are used for
6 x injectors
2 x vvt solenoids
2 x fans
main relay
starter relay
smart alt control
intake manifold solenoid
fuel pump
check engine light

I could probably repurpose the check engine or consolidate the fans i guess

You can add external transistor (BC337) to control the 12v relay.

can a small mosfet be used instead of BC337 in this case? (with a flyback diode across the coil)

puff wrote: ↑

Wed Apr 20, 2022 5:28 pm

can a small mosfet be used instead of BC337 in this case? (with a flyback diode across the coil)

of course

puff wrote:can a small mosfet be used instead of BC337 in this case? (with a flyback diode across the coil)

Yes, no problem

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