Reply to "18 Volt AC Transformer power through 12V DC automotive switches"

stan2004OGR Forum Member

Robertejr posted:
...I was only considering not using relays at spots where the switch, terminal block coming off the TIU, and siding were all relatively close together and wire length wouldn't be an issue for DCS signal.
I'm just coming to the point now where I need to install my first relays, so hopefully after I have done a couple I won't be so concerned about how hard they are to do.

I get it. If you have a lone siding out in the back-forty, you might not have or want to run 12V DC infrastructure wiring for the sake of the relay. As cjack suggests, install a 5-cent diode (e.g., 1N4003) to protect the internal switch LED when used in an AC environment.

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