fuel pump and oil pressure circuits

[tayto]

i think the oil pressure switch is also to take load off the relay contacts which would mean longer contact life. whether this was planned or just a byproduct i an not sure.

in my field it is common we will "double up" the contacts on a circuit if there is a free set of contacts on a relay.

 

[elplatano]

i think the oil pressure switch is also to take load off the relay contacts which would mean longer contact life. whether this was planned or just a byproduct i an not sure.

in my field it is common we will "double up" the contacts on a circuit if there is a free set of contacts on a relay.

Interesting so relying on one pole when 2 designed may also cause premature relay failure because it’s now bias to one instead of being split to 2.

I will still do some digging but this may help!

 

[Erik the Awful]

If your kill switch is for security reasons, I'd recommend not installing it in a way that can interrupt a running engine, but rather interrupts the starter circuit. If it fails, you don't want it leaving you stranded in a bad place. Your primary concern is keeping an unauthorized driver from starting your engine.