[hypoxia]

Looking for ideas for making an open bay door warning.  Each door has a switch which turns that bay LED light on when opened.  What is the best way to send a warning to the driver?

[cwl1979]

You could wire in something like this with a switch to turn it off if your actively outside using the open bay.

https://www.amazon.com/tatoko-Electronic...hdGY&psc=1

[arcticdude]

You could also use wireless sensors. Something like this:

https://www.amazon.com/WiFi-Door-Sensor-...B0BPXVQ359

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Looking for ideas for making an open bay door warning.  Each door has a switch which turns that bay LED light on when opened.  What is the best way to send a warning to the driver?

Wire all the lights into coil of relay, relay then goes to buzzer or light on/near the dash. Relay isolates things so it does not back-feed and turn on the rest of the lights. You would need a relay for each bay light to isolate them.

Reminds me I need to do something like this for my tv antenna, second time I left mine up and headed on down the road.

[hypoxia]

Good ideas.  There are 9 bay doors, 9 relays would work although I'm hoping for a simpler solution.  Wireless could work but it needs to be reliable and not baby sat.  The preferred indicator would be a dash light with or without a noise.
So far my Cargo Door Open alarm has been audio in the form of honking horns.