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12 Volt relay DC resistance
http://forum.porsche356registry.org/viewtopic.php?f=1&t=46395
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Author:  Eric Lenius [ Tue Jul 10, 2018 6:42 pm ]
Post subject:  12 Volt relay DC resistance

Anyone know what the coil DC resistance is on typical 12V horn and headlight relays?

Regards,

Eric Lenius

Author:  John Brooks [ Tue Jul 10, 2018 8:04 pm ]
Post subject:  Re: 12 Volt relay DC resistance

Eric

usually around 2-3 ohms for the coil.

Author:  Eric Lenius [ Wed Jul 11, 2018 1:19 pm ]
Post subject:  Re: 12 Volt relay DC resistance

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.

Author:  Hugo Karasawa [ Wed Jul 11, 2018 8:10 pm ]
Post subject:  Re: 12 Volt relay DC resistance

12v relays around 80 ohms.
6v relays around 40 ohms

Author:  John Brooks [ Wed Jul 11, 2018 9:41 pm ]
Post subject:  Re: 12 Volt relay DC resistance

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

Author:  Eric Lenius [ Thu Jul 12, 2018 12:26 am ]
Post subject:  Re: 12 Volt relay DC resistance

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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