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PostPosted: Tue Jul 10, 2018 6:42 pm 
356 Fan

Joined: Fri Oct 30, 2015 11:12 pm
Posts: 119
Anyone know what the coil DC resistance is on typical 12V horn and headlight relays?

Regards,

Eric Lenius


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PostPosted: Tue Jul 10, 2018 8:04 pm 
356 Fan
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Joined: Tue Jul 08, 2008 11:50 am
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Location: Whidbey Island WA.
Eric

usually around 2-3 ohms for the coil.

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John Brooks

62 Roadster
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PostPosted: Wed Jul 11, 2018 1:19 pm 
356 Fan

Joined: Fri Oct 30, 2015 11:12 pm
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Do you mean 20 to 30 ohms?. At 2 ohms, the coil would draw 6 Amps at 12V. Dissipating 72Watts. Which, would result in a barbequed coil I think.


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PostPosted: Wed Jul 11, 2018 8:10 pm 
356 Fan

Joined: Fri Sep 09, 2016 10:40 pm
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12v relays around 80 ohms.
6v relays around 40 ohms


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PostPosted: Wed Jul 11, 2018 9:41 pm 
356 Fan
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Location: Whidbey Island WA.
Eric

I need to get one of thoes new digital meters. You are right the X10 switch makes the scale different. I just re read the relay, 27 ohms on the 6v and 77 on a 12v

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PostPosted: Thu Jul 12, 2018 12:26 am 
356 Fan

Joined: Fri Oct 30, 2015 11:12 pm
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Hi John,

Which relays are you checking? The resistance is different on the horn relays and the headlight relays I think....


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