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The clicking noise in your car’s fuse box is caused by a relay rapidly switching on and off. This can be caused by a computer failure, resistance in the ground wire for the control side of the relay, or high resistance in the power supply for the control side of the relay. Read on to find out why noise in the fuse box and how to fix it.
Noise in the fuse box: Solution
To find out the source of the problem, you’ll need to do some quick tests with a multimeter. If you don’t have a multimeter, you can buy or rent a lower-end model at your local auto parts store. If you don’t know how to use a multimeter, you will surely find a good tutorial on YouTube.
You should know that Dodge trucks built between 1992 and 1995 have a common problem with the PCM. The main computer board cracks causing the ASD and fuel pump to cycle on and off constantly.
Locate the problem relay.
Open the lid of your fuse box and take a look at the relays, the little black cubes scattered around the fuse box. Hold the handle of a screwdriver to your ear and touch the top of each relay with the tip of the screwdriver. When you hear a repetitive ticking through the screwdriver, you have found your troublesome relay.
Advice
Relays control a high current circuit using low current. It allows things like the headlights and fuel pump to be controlled without high amperage current entering the passenger compartment.
Try changing the relay.
Remove the relay from the fuse box and pull it out, as that is the cause of the noise in the fuse box for sure. Swap it out for another identical relay with the same number of terminals from the fuse box to see if that relay also clicks. If that relay clicks constantly too, you need to do more testing. If that relay works fine, then the original relay that was in that location is faulty. Simply replace that relay with a new one.
Identify the terminals on the relay.
Look at the terminal labels on the relay. They are identified as 30, 85, 86, 87 and 87a, if it is a five terminal relay. Terminal 30 receives a constant battery voltage. Terminal 85 is the relay connection to ground, 87 and 87a are the output terminals for whatever the relay controls, and 86 is the power to the control side of the relay.
Check that the ground connection of the relay is constant.
Identify the slot in the fuse box that terminal 85 plugs into. Adjust the multimeter so that it reads the voltage on the 20-volt scale. Plug the negative lead of your multimeter into the slot for terminal No. 85 and touch the positive lead to the positive terminal of the battery. You should see that the battery voltage is constant. If the voltage flickers, repair the ground wire and the ground wire that connects to terminal #85. If you get a steady voltage, continue to the next step.
Caveat
When touching the test leads to the battery terminals, hold them with their plastic handles to avoid electrocution.
Check the power quality on the switching side of the relay.
Plug the positive lead of your multimeter into the slot for terminal No. 86 and turn on the ignition, then touch the positive lead of the multimeter to the negative terminal of the battery. If the voltage varies, the problem is with what is supposed to activate the relay, such as the computer or a switch. Inspect wiring to terminal No. 86 and make any necessary repairs. If you don’t discover any damage to the wiring for terminal #86, replace the component that controls the relay. Well this is what you should do if you notice any noise in the fuse box.
The clicking noise in your car’s fuse box is caused by a relay rapidly switching on and off. This can be caused by a computer failure, resistance in the ground wire for the control side of the relay, or high resistance in the power supply for the control side of the relay. Read on to find out why noise in the fuse box and how to fix it.
Noise in the fuse box: Solution
To find out the source of the problem, you’ll need to do some quick tests with a multimeter. If you don’t have a multimeter, you can buy or rent a lower-end model at your local auto parts store. If you don’t know how to use a multimeter, you will surely find a good tutorial on YouTube.
You should know that Dodge trucks built between 1992 and 1995 have a common problem with the PCM. The main computer board cracks causing the ASD and fuel pump to cycle on and off constantly.
Locate the problem relay.
Open the lid of your fuse box and take a look at the relays, the little black cubes scattered around the fuse box. Hold the handle of a screwdriver to your ear and touch the top of each relay with the tip of the screwdriver. When you hear a repetitive ticking through the screwdriver, you have found your troublesome relay.
Advice
Relays control a high current circuit using low current. It allows things like the headlights and fuel pump to be controlled without high amperage current entering the passenger compartment.
Try changing the relay.
Remove the relay from the fuse box and pull it out, as that is the cause of the noise in the fuse box for sure. Swap it out for another identical relay with the same number of terminals from the fuse box to see if that relay also clicks. If that relay clicks constantly too, you need to do more testing. If that relay works fine, then the original relay that was in that location is faulty. Simply replace that relay with a new one.
Identify the terminals on the relay.
Look at the terminal labels on the relay. They are identified as 30, 85, 86, 87 and 87a, if it is a five terminal relay. Terminal 30 receives a constant battery voltage. Terminal 85 is the relay connection to ground, 87 and 87a are the output terminals for whatever the relay controls, and 86 is the power to the control side of the relay.
Check that the ground connection of the relay is constant.
Identify the slot in the fuse box that terminal 85 plugs into. Adjust the multimeter so that it reads the voltage on the 20-volt scale. Plug the negative lead of your multimeter into the slot for terminal No. 85 and touch the positive lead to the positive terminal of the battery. You should see that the battery voltage is constant. If the voltage flickers, repair the ground wire and the ground wire that connects to terminal #85. If you get a steady voltage, continue to the next step.
Caveat
When touching the test leads to the battery terminals, hold them with their plastic handles to avoid electrocution.
Check the power quality on the switching side of the relay.
Plug the positive lead of your multimeter into the slot for terminal No. 86 and turn on the ignition, then touch the positive lead of the multimeter to the negative terminal of the battery. If the voltage varies, the problem is with what is supposed to activate the relay, such as the computer or a switch. Inspect wiring to terminal No. 86 and make any necessary repairs. If you don’t discover any damage to the wiring for terminal #86, replace the component that controls the relay. Well this is what you should do if you notice any noise in the fuse box.
