Are 12V relays interchangeable?
Most Automotive relays follow a strict design style that allows them to be mostly interchangeable. One of the most important thing is to make sure you relay is the correct voltage (most common is 12 Volts), and has enough current capacity (Amps) for your application.
Are all relays the same?
Not all relays are the same. Example is the main relay. It is actually two relays internally. However, normal relays are pretty similar so if you know how to wire it up then a standard relay will get it done.
How can I tell if my fuel pump relay is working?
This will pull in the fuel pump relay and you SHOULD get 12VDC at the fuel pump connector with the ingnition switch ON. If it passes this test, the fuel pump relay CONTACTS AND COIL are working. If it fails this test , you probably have a BAD Fuel Pump RELAY.
How does a 12 volt relay save power?
A number of years ago before power mosfet’s with a low on resistance were readily available, I developed a circuit with a 12 volt power relay that consumed less power than the on resistance of a power mosfet. The trick was to turn on the relay and a few seconds reduce the coil voltage. For one relay it is very practical.
When do you need to troubleshoot a relay?
That is, on a horn, 12V should always be present on 86, and 85 is grounded when the horn button is pressed). If the control side fails either of these tests, you must troubleshoot the wiring. Often it is a problem in whatever is switching the control side on and off.
How many volts can a 12VDC coil relay handle?
It has been my experience that a 12VDC coil relay is designed for a maximum of 12 volts. In an automotive application the voltage can be higher than 14 volts. I have also found that most DC relays once energized the coil voltage can be reduced to about half of normal and not affect the holding power of the contacts,…
This will pull in the fuel pump relay and you SHOULD get 12VDC at the fuel pump connector with the ingnition switch ON. If it passes this test, the fuel pump relay CONTACTS AND COIL are working. If it fails this test , you probably have a BAD Fuel Pump RELAY.
That is, on a horn, 12V should always be present on 86, and 85 is grounded when the horn button is pressed). If the control side fails either of these tests, you must troubleshoot the wiring. Often it is a problem in whatever is switching the control side on and off.
How long does fuel pump stay at 12 VDC?
You should have 12VDC when you crank the engine over. It will stay at 12 VDC for 3-5 seconds after you stop cranking the engine IF you leave the ignition switch in the ON or RUN position IF IT PASSES THIS TEST< THERE IS SOMETHING GOING ON WITH THE FUEL PUMP> GO TO THE FUEL PUMP SECTION BELOW >>>> 5.
Where do I find the relays on my car?
Look inside the power center under the hood — a box with relays — or along the firewall or the fuse box(es) under the dashboard and side kick panels. On the back of the lid of these boxes you may find markings showing the relays they house and a short description of each.