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12v 20A relay, what would a typical coil resistance be?
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Dave
Rough guess - 70 ohms.
What's the context? I'll measure one if necessary.
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I'm moving to Sweden next month, so wanted to fit daytime running lights instead of having everything on all the time. So I'm going to wire them up to an ignition live, but they need to go out when the main lights are switched on (at night).
So I figured I'd use a normally closed relay that opens with a feed from the headlight circuit, but I've had trouble getting a NC relay. I've found one in my 'spares bucket' with a resistance of 48ohms, which seemed a bit high.
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Dave
NC four-pin relays are rare; use a common five-pin minicube change-over relay and wire the load between 30 and 87a - insulating 87 for safety.
I've just checked a handful from the relay box and [at around 25 degrees] the resistance reading between 85/86 varied from 65 to 95 ohms, with most around 73.
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