Using 12v relay to switch ground

Adding a relay to detect when a switch tied to ground is open.

Couple of possibilities. You could use the door ajar switch to provide the 0V/gnd to a 12v relay, this would be held energised whenever the door ...

How much Current Do Relays Draw? - Electrical - Classic Zcar Club

You could also just bridge the 12V source to Pins 87 ( the relay contacts) and 30 (the coil) and go from pin 30 to ground with a switch in the ...

DC Switch on Positive or Negative or Does it Matter?

So, same with a negative ground DC system... You need to switch the positive... If you switch the negative, then there will still be a positive ...

Chattering 12v DC Relay When Switching 220v AC?

It is possible it is inducing a voltage to the coil. If in fact, it is a low voltage DC relay, you will have to find one that is rated for ...

Using Relays | Yellow Bullet Forums

You can also put the switch on the ground side (wire hot to the "south", put the switch on the "north") this is easier, as you only need one ...

Relay wiring question | BobIsTheOilGuy - Bob is the Oil Guy

What size AWG does a ground wire for a 30 amp BOSCH style relay need to match with? Does it need to be the same gauge as the switched (18 ...

Neutral switch ground to 12v - Yamaha XJ Motorcycle Forum - XJBikes

The neutral switch was the ground to light the bulb. It worked in conjunction with the clutch safety switch and diode block and relay to keep you safe.

How can I wire this 12v switch ( split charge relay)

I've got the switch wired inline on the ground wire but as it's not really switching a load there's no way I can use the switch ground and light the LED. Or is ...

toggle switch to ground relay - Dodge RamCharger Central

You could just fuse your 12v supply line also, either way I would recommend running a fuse somewhere in that circuit anyway and not just relying ...

Illuminated rocker switch to control switched ground - without a relay?

You just need a hot wire to the light terminal and run a ground wire into the switch and a wire on the switch that connects that ground wire ...

12V relay to switch 12V lights - Raspberry Pi Forums

Most of these relay boards are active low , so you need to connect IN pin to a ground to turn the relay on, so you will need an interface ...

Relay Switch testing - XJ - Jag-lovers Forums

... in a good relay. When power is applied to pins 85 and 86 (12V + ... Either one can have +12v connected, but the other has to go to ground.

Negative Relay Switching? - The Jalopy Journal

Simply put you are switching the ground side of the relay rather than with 12 V from the switch. What we know as a normal positive switched ...

Relay size and wiring help for golf cart project. - DIY Chatroom

It's one 48v battery. The switch I want to use is only rated for 12v though. All of the accessories run through a 48v to 12v reducer. So I was ...

12v relay turns on when power fails - Electronics Q&A - CircuitLab

You don't need the pull down resistor if the main DC source, on failure, provides a path to ground (ideal source). With that pull down resistor, ...

Controlling 8 channel 12V relay with Pi - Core Electronics Forum

You have it currently set to switch to ground. So if you connected one terminal of a device such as a lamp to the NO connector and connected the ...

Relay help - DigiKey Forum

I'm working on adding after-market fog lights to a Toyota, normally we just connect a relay to 12v off of the high beam feed and ground and ...

12v relay to open and an close switch without sending power to switch

I'm trying to power a relay via 12v DC (vehicle) to open a closed switch while the 12v power is sent to the relay.

Pressure switch/Relay question? | S-10 Forum

When the pressure switch close it supplies the ground to the switch in the relay ... 12v to the compressor via pins 30 & 87. Basically the ...

How to make a simple circuit with a 12v relay that switches off and ...

Connect the 12v relay coil to the supply, via the three reed switches wired in parallel. Connect a high speed diode across the relay coil, to ...