Blown Relay

If one of your accessories doesnt come on and you suspect the relay is bad you. If the test light lights up you know that there is a short in the wire between the relay and the cooling fan relay. Every once in a while you need to test a relay and when you do its important to check it thoroughly if.

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How To Check For A Faulty Relay Grainews

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Is Blown Relay Switch A Sign Of Other Problems Hot Rod

If a fuse blows or a relay fails the computer will pick up the signal and activate the check engine light to alert the driver that a problem has occurred.

Blown relay. Access to test a relay in place can be difficult. As the relay is the switch that supplies current to the blower motor if it fails internally then power will be cut off from the blower motor circuit causing the motor to no longer function or blow any air from the vents. If a connector is loose fitting it can generate heat and cause the fuse to blow. One of the first symptoms of a bad or failing ac blower motor relay is a blown ac blower motor relay circuit fuse.

With the relay removed from the fuse box the multimeter set to measure dc voltage and the switch in the cab activated first check to see if there are 12 volts at the 85 position in the fuse box where the relay plugs in or wherever the relay is located. Take a good visual examination of all the wires and connectors on the circuit. In the diagram above the computer supplies current to the relay which is grounded. Once energized the relay conducts power to the fuel pump.

One of the first symptoms of a blown fuse or relay is an illuminated abs light. The abs light will become illuminated once the computer has detected that there is a problem with the system. Heres a simply way to test the actual relay mounted in the relay box. How to test relays ericthecarguy how to test relays is a video about just what it says.

A relay is often used with computers to control analog devices. Whenever you operate a switch to an accessory in your car that carries a lot of current such as the lights wipers or horn you run a small amount of current through a relay which in turn closes contacts to operate the accessory. If there isnt check to see if the appropriate fuse has blown. This arrangement allows the.

The computer may supply power or a ground to a low amperage relay that turns a high amperage device on or off.