I’ve been puzzling this in my head, and I think I have an idea, but know there are Dopers with much more comprehensive auto and electrical knowledge than me, so I thought I’d ask for advice.
The context is wiring a 12v device in my car that needs a beefy power supply. Typically, I’d just throw a Bosch SPST on there with the right trigger wire, and call it a day. However, I’d like this relay to need two distinct hot triggers to trigger the main power circuit.
After thinking of it, my thought was get two SPST relays - wire the first one up so that when triggered by the first hot (at post 85), it shows ground (at post 87, via 30 being grounded), then connect the other end of that ground to the ground side of the other SPST trigger circuit (post 86, relay 2). Then wire my second hot to the hot side of that SPST-grounded trigger circuit (post 85, relay 2), and my actual hot out (87 relay 2) to the device on the triggered end.
Would this work? Is it a bad idea for any reason?
Are there simpler or more elegant solutions (maybe using a single SPDT relay?) Thanks to any who post!