Classic cars forum & vehicle restoration.
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Ray White
Joined: 02 Dec 2014 Posts: 6342 Location: Derby
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Posted: Tue Jan 30, 2024 12:19 pm Post subject: Relay question. |
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A little knowledge can be a dangerous thing, so as I only have a little knowledge of electrical things please may I ask a question here.
My 1949 MG TC is positive earth and I want to fit a relay to an electric fan that I have installed.
As I have electronics that need protecting from voltage spikes I have opted for a relay with diode protection.
I understand that unlike normal relays, a diode makes the relay polarity sensitive.
Have I wired this relay correctly? I am showing the positive earth at terminal 86. Is this correct or should the earth be connected to terminal 85?
Any help would be appreciated. Thankyou. |
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ukdave2002
Joined: 23 Nov 2007 Posts: 4117 Location: South Cheshire
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Posted: Tue Jan 30, 2024 12:48 pm Post subject: |
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No, that would introduce a short circuit when the fan is switched on, you need to reverse connections 85 & 86.
Dave |
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Ray White
Joined: 02 Dec 2014 Posts: 6342 Location: Derby
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Posted: Tue Jan 30, 2024 12:56 pm Post subject: |
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ukdave2002 wrote: | No, that would introduce a short circuit when the fan is switched on, you need to reverse connections 85 & 86.
Dave |
Many thanks, Dave. |
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ukdave2002
Joined: 23 Nov 2007 Posts: 4117 Location: South Cheshire
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Posted: Tue Jan 30, 2024 1:18 pm Post subject: |
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Sorry Ray
I'm talking rubbish, your circuit is correct for +ve earth!
Sorry |
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Ray White
Joined: 02 Dec 2014 Posts: 6342 Location: Derby
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Posted: Tue Jan 30, 2024 6:43 pm Post subject: |
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ukdave2002 wrote: | Sorry Ray
I'm talking rubbish, your circuit is correct for +ve earth!
Sorry |
No worries Dave.
The main thing is that I get it right in the end.
I am only trying to make the wiring as safe as I can.
There are so many stories of these cars going up in smoke .
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